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Newegg.com has the Intel Core 2 Duo E8400 CPU + Thermaltake 700W ATX Power Supply for $173.99 after $50 rebate [exp. 08/15/08] with free shipping.
Scroll down the page and at the bottom left, add the combo deal:
Intel Core 2 Duo E8400 CPU + Thermaltake 700W ATX Power Supply.
Enter $26 off code EMCAJBCAB.
Use $50 rebate [Exp 08/15/08] at this link
Final Price for this deal: $249.99 - $26 - $50 = $173.99 + Free Shipping