Which programmers work with the Atmel Raven boards?
Any programmer/debugger that supports the AVR controllers on the Raven boards should be suitable, I'd use an AVR Dragon ($50) instead of the specified JTAG ICE Mk II. Clones like that one available from Olimex only support programming, not debugging.

The JTAG ICE Mk II might still be available for half-price from Arrow.