Here’s a brief list of the changes AMD has done to the pricing of their processors.  Follow this link for the entire list.
AMD Athlon™ 64 FX Processor
  • Athlon 64 FX-62 – $713
AMD Athlon™ 64 X2 Dual-Core Processor
  • Athlon 64 X2 5600+ – $326
  • Athlon 64 X2 5400+ – $267
  • Athlon 64 X2 5200+ – $232
  • Athlon 64 X2 5000+ – $222
  • Athlon 64 X2 4800+ – $217
  • Athlon 64 X2 4600+ – $195
  • Athlon 64 X2 4400+ – $170
  • Athlon 64 X2 4200+ – $159
  • Athlon 64 X2 4200+ – $159
  • Athlon 64 X2 4000+ – $144
  • Athlon 64 X2 3800+ – $113
  • Athlon 64 X2 3600+ – $102