On the right of the page you'll see Triode Corp., 47 Labs, and Elekit kits.
I built the Elekit TU-879 and think it's a good amp for the money, excellent instructions.
http://vkmusic.ca/
Min sells some of his amps as an unassembled package with case. Minimal instructions, you'll need to point-to-point wire it up.
I built the WE 91A 2A3 SET and like it a lot.
http://www.tubeaudiolab.com/
Good luck, have fun