Gravitech still carries them too
Not unreliable at all. I have about 10 of them running, turned on en masse 3 times a week for a couple of hours at a time.
Want to go smaller?
Make your own board?
http://www.nkcelectronics.com/arduino-runtime-board-rev-b.html
Or surface mount?
Cross Roads Electronics $3 a bare board, includes US mail (to US address)