The Redskins Rarities album was a bootleg and only ever came out on vinyl. It's quite hard to find these days but does crop up on ebay from time to time. Expect to pay around £15-£20 for a copy.
The Redskins live album was reissued the other year by Mad Butcher Records. But don't order the CD from the Mad Butcher website as he'll only rip you off. Instead order it from www.gemm.com or www.netsounds.com