These modules have been around for a while, but they fascinate me. For only US $9.46 you get a fully functional 1 Watt transceiver working on either VHF or UHF. The last letter in the model number tells you which version it is. The modules are available on eBay see link below.
Read the main article here:
Make your own transceiver with a Dorji DRA818U or DRA818V
Where to purchase the board: