1. At least one non-transitory computer-readable storage medium storing a computer-executable e-commerce transaction facilitation program, the program comprising: a sales routine; a procurement routine; and instructions for transferring a quotation from the sales routine to the procurement routine; instructions for transferring a reverse tender/quotation from the procurement routine to the sales routine; instructions for permitting modification of the quotation and the reverse tender/quotation based on negotiation of terms of a sale; instructions for transferring a purchase order from the procurement routine to the sales routine; instructions for tracking sales orders; instructions for tracking purchase orders; instructions for operatively connecting the sales routine with a seller via the Internet; instructions for operatively connecting the procurement routine to a buyer via the Internet; instructions allowing the sales routine and the procurement routine to be executed by a user connected to one of the sales routine and the procurement routine via the Internet, wherein: the sales routine includes instructions for determining a desirability value of at least one trading profile representing a reverse tender quotation communicated to the sales routine from the procurement routine; the procurement routine includes instructions for determining a desirability value of at least one trading profile representing a quotation communicated to the procurement routine from the sales routine; and the sales routine or the procurement routine further includes instructions for indicating the trading profile with a highest desirability value.