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I have a lot of MAME stuff and various others (SNES mainly I think).
Newsgroups are the easiest option I find, have a search on https://nzbindex.com/ I find the easiest way is filter down to the emulator groups and search with a large minimum file size to find libraries rather than individual ROMs.
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I built an arcade a couple of years ago, it's powered by a pi3. Do you know which emulator you want to run. I use the mame-libreto (lr-mame2003), which is rock solid with the pi3 and has great shaders for crt emulation. I've got the the full rom set which I'd be happy to share but it's about 30gb (over 3000 games). If you search for mame 0.78 rom set you should be able to find it pretty easily.
Have a look into attract mode too, it's an alternative front end for retropie that's a lot better than emulation station for arcades.
Anyone got an arcade box running retropie/similar with a library they might be willing to share.
Just built a picade but struggling to fill it.
DM if need be.