These are pretty nice for permanent Arduino projects. NKC has Freeduino runtime PCBs on sale right now for $1.99. Note that these do not contain a FTDI header or USB, so the AVR has to be programmed via ICSP or on an Arduino first. Still a nice little board, and you cant beat the price.
Not at all affiliated with NKC, just a happy customer.
link here: http://www.nkcelectronics.com/arduino-runtime-board-rev-b.html