Ok, I went back to that store that I saw before that was selling them for $20 (boxed). I was told that they were mismarked, and that the guy had ordered them from "some wholesaler or something that had a bunch of old new-in-a-box turbo stuff" left over from whenever. That sounded kinda like that business with the Canadian stuff people are ordering from the UK.
Anyhow, to recoup the cost + shipping the guy paid for them, they're marked up to $49.99 - not such a deal. I should've expected something like that I guess, since their turbopads sell for $20 used in little baggies. On an unrelated note, they had a "complete" copy of Valis 3, case and all - but for $50 (more than I'd want to pay).
I guess barring some other discoveries, Ebay probably remains the best bet if you don't want to get totally ripped off. As a side note, the last time I searched for a turbo stick on the amazon marketplace, a bunch of vibrators came up - I found that amusing.