Newegg has the following deal today only, SIGMA Power Engine SP-535 535W ATX12V V2.01 SLI Ready CrossFire Ready Power Supply for 29.99 - $10.00 rebate = $19.99.

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Rebate: $10-mail-in (Exp 3/1/09)
Let Sigma’s SP-535 Power Engine drive your system for stable performance while working or playing. This 535W PSU has [...]