The formula for this is going to be bands who were more popular/desirable then than now.
I'll start with Genesis. From Selling England through Abacab, you can get VG+ and even NM American vinyl for $7-$8.
Agreed with Yes, but forget about getting a first UK pressing in the same price range as the US ones.
Bruce Springsteen. You can get his main sequence albums (up through Born in the USA) in great shape for $5-$10. Per the formula, it's because they made a shit-ton of them back at the time, and although Bruce is still popular, it's not like it used to be.
Pretty much the same thing with Little Feat. And Steely Dan (although some of those first few Dan albums have early variants desired by collectors/audiophiles that brings the prices of those up).
I'm going to add the Mothers of Invention albums on Verve or Bizarre to this, though the prices are typically in the $12-$20 range for copies in really good playable shape, and maybe $20-$35 for NM. I do this for a combination of reasons involving collectibility and the value of the music. First, the era: you're getting original '60s vinyl from the country of origin in great shape for about the same price as the latest sealed contemporary reissue; sometimes less. Try doing that with other major '60s American artists, or British bands for their British pressings. Obviously there are some examples, but not too many. Also, it's not that hard to find many of these in good shape - whatever the reason (hey, maybe people back in the '60s just played this stuff a few times and then shelved it for being too weird). Several of these didn't get a bunch of represses, so you usually don't have to try that hard to find originals. Sure, a good number of these were made (if not, they wouldn't be affordable), but we're not talking anything like the quantities for the above mentioned Bruce Springsteen, Steely Dan, Elton John, etc., where you could probably fill all of the nation's dumpsters with '70s presses of albums by these artists and still have copies left over. Also, until the CD catalog was reissued in 2012-2013, the vinyl records were the only way to hear the original mixes of these (and the other) Frank Zappa albums. So there is also a very practical reason to own them if one likes them. In short, you get some of the best and most influential music of the era, albeit for a niche taste, not pressed in huge quantities (which means potential for greater value/collectibility down the road) for prices comparable to a new reissue. Oh, and most of the album covers are fantastic - the LP sized Weasels is practically frameable. A shiny clean $10 copy of A Passion Play or Honky Chateau just doesn't inspire the same kind of enthusiasm in me.