You don't get ROMs for PSX, you get CD images instead, which will be several hundred MBs large, which also means they're not easy to find (you certainly won't find them on web sites). Even if you do find a copy, they'll take a while to download, and even if you manage that, the average user won't know what to do with the image anyway

If you're debating over buying it, you might as well get it, since this game is worth it