Microcenter.com occasionally has these crazy deals on AMD FX processors + motherboard bundles where the processor is heavily discounted and they give you $40 of

Microcenter.com occasionally has these crazy deals on AMD FX processors + motherboard bundles where the processor is heavily discounted and they give you $40 off a motherboard. This has let me build out several 8-core, 16GB DDR3 (expandable to 32GB usually) + case + smallish disk systems for crash and burn use for around $300. They're not exactly Xeons, but for what I'm doing, they're perfect.