Getting sensor data wirelessly from arduino to PC
Xbee costs about 1000INR. They are really expensive. You should buy HC-05 module, which costs about 320INR.
You can easily interface them with Bluetooth of your Laptop using Processing Application.

You can even use ESP8266 ESP-01 Wireless Module. They Cost about 3$.
Wireless module gets connected with your router. this tutorial will help you to start. You can by this module from here.

nRF24l01+ modules can not be interfaced with Laptop...