"Does anyone have a site where I can download them from where they are already in the correct format?"
but you've been emulating for years tho right?
Besides PS1 is one of the platforms where you can rip your own images from games you own without any special hardware, although of course an emulation veteran would know that already....
GPD Win, GPD XD 64gb, PlayGo, RS-90, 3DS XL, DSi XL, GBA SP, GBBC Clone, Gameboy Pocket c/w screen mod, PSP Go
ASUS TUF, Medion Erazer, Toshiba Z20t, Dell Mini 9, Psion 5MX, Toshiba 3480ct
Tons of other old laptops and tablets.....