These two low cost QRP SSB transceivers are available from www.hfsignals.com and have become extremely popular.
The BITX40 is a 40m only SSB radio with an output of 5 to 7W.
The Micro-BITX (uBITX) is a general coverage, 10 watts HF SSB/CW transceiver. It features digital tuning, dual VFOs, RIT, CW Keyer and more. It is a small 6 inches by 5-1/2 inch board with minimum wires and controls that you can drop into any box.
Both of these transceivers are sold as "semi-kits" with all components installed on the circuit boards. You just have to put it in a case of your choice and connect the wires.
These radios can be assembled and used by amateurs with both Basic with Honours, and Advanced Qualifications.