That last one should be a great overclocker, at a great price:

4000+ 939 1MB L2 2.4 GHz "BN" (Rev E) $637
3700+ 939 1MB L2 2.2 GHz "BN" (Rev E) $327
3500+ 939 1MB L2 2.0 GHz "BN" (Rev E) $270

http://epscontest.com/prices/rm_2005_04_11.htm

(This list somes from someone who has access to 2 AMD distributors, and shares the data weekly.)