50€ germanyWhat is your budget and region?
Usually, I would recommend a Corsair CX450/CX550 or their modular CX450M/CX550M siblings.
Thank youhttps://www.amazon.de/Corsair-CX450-PC-Netzteil-Plus-Bronze/dp/B06X6BFY3Q/ref=sr_1_3?__mk_de_DE=ÅMÅŽÕÑ&keywords=CX450&qid=1584052416&sr=8-3
On the second look, here is a Corsair CX450 around 50 euro.