These deals are available in the Houston area, but will likely be applicable to other areas as well. Please feel free to post whether it's valid where you live. These are available in the B&M stores, and occasionally, you'll see something similar at outpost.com
Athlon 64 X2 3800 w/ ECS K8T890 MB -- $279.99 The motherboard has AGP and PCIe slots, costs $64 on newegg. Sell the MB on ebay, and you've got a great deal on an X2 3800.
Athlon 64 3500 w/ ECS K8T890 MB -- $199.99 Same MB as above.
Sempron 2800 (S754) w/ ECS 755-A2 MB -- $79 MB sells for $44 on newegg, CPU for $75. A similar combo (with an ECS nForce3 MB) is available on outpost.com
Athlon 64 X2 3800 w/ ECS K8T890 MB -- $279.99 The motherboard has AGP and PCIe slots, costs $64 on newegg. Sell the MB on ebay, and you've got a great deal on an X2 3800.
Athlon 64 3500 w/ ECS K8T890 MB -- $199.99 Same MB as above.
Sempron 2800 (S754) w/ ECS 755-A2 MB -- $79 MB sells for $44 on newegg, CPU for $75. A similar combo (with an ECS nForce3 MB) is available on outpost.com