For amd ryzen apu you can buy 300 watt pico psu + 120 watt brick adapter ac dc they are more cheaper

RGEEK 1106 DC to DC ATX PSU 12V 300W Pico ATX Switch PSU 24pin Mini ITX PC Power Supply for Computer

https://www.amazon.com/RGEEK-Switch-24pin-Supply-Computer/dp/B071P3HMNK