$35 - 1X HP 759763-001 or 849648-002 Atx Power Supply Unit (PSU) - Rated At 300-Watts (Gamay-S), Regulated
$20 - 1X HP 715185-001 or 667893-003 300 Watt Power Supply For Pro 3500 Microtower Pc
Both are pulled from working computers. Even though they are designed and sold by HP, they can be used as generic ATX form factor desktop power supply. Both power supplies have the same standard ATX dimensions: 150mm Wide x 140mm Depth x 86mm Height.
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