300W 1u Flex ATX Power Supply 90-264V AC 3A 50-60Hz 1U Small Desktop Computer PSU(300W) - Newegg.com
Bestec ATX-300-12EB3 300 Watt Power Supply
X300, 300w Output, 16-24v Wide Input Dc-dc Atx Power Supply (vr Ready Pico Psu) Mini Itx Dc To Car Atx Pc Power Module Gtx1070 - Pc Power Supplies - AliExpress
HP ATX-300-12Z - 300W 24-Pin ATX Power Supply for HP Computers - CPU Medics
300W ATX Computer Power Supply - ATX Power Supplies | StarTech.com