Today AMD has renewed it`s pricelist. Almost every processor became cheaper.

AMD X2 family
-4800+ $902 (-9.9%)
-4600+ $704 (-12.3%)
-4400+ $537 (-7.6%)
-4200+ $482 (-10.2%)
-3800+ $354 (new model)

AMD64
-4000+ $375 (-22.2%)
-3800+ $329 (-11.8%)
-3700+ $272 (-17.3%)
-3500+ $223 (-18%)

Dual-core Opterons haven`t been cut in price, only single-core ones.

AMD ofc pricelist