Ebuyer appear to have got hold of some more stock of the Phenom II based Athlon X2 5000+ (45nm, 2.2GHz, AM2+): http://www.ebuyer.com/product/222272
These used to be locked and downclocked full Phenom IIs with 4 cores and a full 6MB of L2 cache, and a few people had success unlocking and overclocking them. Given that the asking price is less than £32, I figured one or two people on here might fancy taking a chance on one...