1. A system for notifying users of time limited offers in an online marketplace comprising: at least one processing device; and at least one computer readable storage device storing data instructions that, when executed by the at least one processing device, cause the at least one processing device to generate an online marketplace for seller-financed transactions, wherein the instructions cause the at least one processing device to: generate, using the at least one processing device, a user interface presenting a plurality of listings of transaction offerings that are available from sellers over time for at least two payments, wherein the listings of transaction offerings include transaction offerings across a plurality of different transaction offering categories; generate in the user interface, using the at least one processing device, trust profiles for users of the online marketplace, the trust profiles including information that allows both buyers and the sellers to evaluate trustworthiness of each other prior to entering into the seller-financed transactions, wherein the trust profiles include reputation data including: reputational factors, including: at least one rating of at least one of the user's prior transactions, from another user; historical data about the user's conformance to terms of the user's prior transactions; and information about a verification level of the user; and a trust score computed based on at least some of the reputational factors, including a number of the user's prior transactions; interact with the buyers and the sellers through the user interface, using the at least one processing device, to define terms of the seller-financed transactions, comprising: receive an offer from a first user of the buyers and the sellers for one of the transaction offerings, the offer including offer details and a time limit; generate an offer alert from the offer that includes the offer details, the time limit, and a customized link, which is selectable by a second user of the buyers and the sellers to view the offer on the online marketplace; format the offer alert according to a preferred offer communication method for the second user; transmit the formatted offer alert to the second user over a wireless communication network, wherein the formatted offer alert upon receipt instantaneously activates an application on a remote computing device to display the formatted offer alert and enable connection via the customized link to the online marketplace over the Internet upon connection of the remote computing device via the customized link, generating for display on the remote computing device to the second user: a listing for the one of the transaction offerings; the offer including the offer details; the trust profile for the first user; and an option to accept the offer; and receive an acceptance from the second user; and monitor, using the at least one processing device, compliance with the terms of the seller-financed transactions including receipt of payments over time from the buyers.
1. A system for notifying users of time limited offers in an online marketplace comprising: at least one processing device; and at least one computer readable storage device storing data instructions that, when executed by the at least one processing device, cause the at least one processing device to generate an online marketplace for seller-financed transactions, wherein the instructions cause the at least one processing device to: generate, using the at least one processing device, a user interface presenting a plurality of listings of transaction offerings that are available from sellers over time for at least two payments, wherein the listings of transaction offerings include transaction offerings across a plurality of different transaction offering categories; generate in the user interface, using the at least one processing device, trust profiles for users of the online marketplace, the trust profiles including information that allows both buyers and the sellers to evaluate trustworthiness of each other prior to entering into the seller-financed transactions, wherein the trust profiles include reputation data including: reputational factors, including: at least one rating of at least one of the user's prior transactions, from another user; historical data about the user's conformance to terms of the user's prior transactions; and information about a verification level of the user; and a trust score computed based on at least some of the reputational factors, including a number of the user's prior transactions; interact with the buyers and the sellers through the user interface, using the at least one processing device, to define terms of the seller-financed transactions, comprising: receive an offer from a first user of the buyers and the sellers for one of the transaction offerings, the offer including offer details and a time limit; generate an offer alert from the offer that includes the offer details, the time limit, and a customized link, which is selectable by a second user of the buyers and the sellers to view the offer on the online marketplace; format the offer alert according to a preferred offer communication method for the second user; transmit the formatted offer alert to the second user over a wireless communication network, wherein the formatted offer alert upon receipt instantaneously activates an application on a remote computing device to display the formatted offer alert and enable connection via the customized link to the online marketplace over the Internet upon connection of the remote computing device via the customized link, generating for display on the remote computing device to the second user: a listing for the one of the transaction offerings; the offer including the offer details; the trust profile for the first user; and an option to accept the offer; and receive an acceptance from the second user; and monitor, using the at least one processing device, compliance with the terms of the seller-financed transactions including receipt of payments over time from the buyers. 10. The system of claim 1 , wherein the instructions further cause the at least one processing device to define a neighborhood for a subset of the users by sending invitations and receiving acceptances of the invitations, and sharing at least some of the listings of transaction offerings among the subset of the users in the neighborhood.