Romsmania is the best site for ROMs in general, but I've also heard that vimm.net is. After doing some research, I've discovered that many people advise others to avoid romsmania because it instals exe files and other questionable files; on the other hand, vimm does have a great selection of games, but the site just looks sketchy. 
https://www.webtechmantra.com/romsmania/
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