Wireles thermometer for Raspberry Pi


I'm working on home automation project for school and I would like to make a wireless thermometer that sends data to Rpi. Does anybody have experience with this sort of stuff. I would like to have some tips about building this. I don't have much money so cheaper is better.

Also it would be nice if  there's already program for it or web plugin.


The most useful things that i found: 

The store: http://www.privateeyepi.com/store/

Slice of Pi: http://tinyurl.com/lefu6cx

Wireless base station transmitter/receiver: http://tinyurl.com/jwo9mox

Wireless Temp sensor:  http://tinyurl.com/my7zgnb
(I hope this is the right part of the forum.