Going to order an HP a1114n, need help with the PSU

[PotatoSandWitch]

Im ordering this computer and I'm going to upgrade its graphics, but I couldn't find the default PSU anywhere, and if I need to upgrade it, I need help choosing one that will fit.

 

[LiLithTecH]

It comes with a 300W (Merlot B) Power Supply (HP Part#5188-0129).

Good luck finding something to fit.
HP uses odd configurations in the Pavillion making it next to impossible
to retro fit any aftermarket PSU in the PC.