I've bought a few things like tanks, lights and weights on craigs list and have noticed quite a few people selling wet suits on there also.  Might be worth trying - it is free after all.

Steve

I'd bet that Jimm Elliot and Diveheart would really appreciate wetsuit donations.  It is a great cause and they can use all the help they can get.  The donation is probably tax deductible also.  Check-out the website at www.diveheart.com