Unfortunately you really won’t find that much on KLOV. Yes, they do have a sub forum for EM, but it’s not really active.

I collect EM games and own about a 15 or so of them. I find your best bet is coastal cities on the west coast. These thing were in every boardwalk arcade up and down the coasts. Seems like they mostly show up there and secondly places like Chicago which is where a lot of them were made.
Out here in Arizona they rarely come up for sale. We just were not big enough back then and didn’t have a ton of Arcades like the coastal cities did. They just don’t seem to show up at all in certain regions.
West coast auction like Captains auction get them run through there often enough so you might try there.
Other than that, I have picked up quite a few of mine off from CL in California.