@ pair I now are from PPP. They were sold about a month apart too. Pair 1 was very lucky. Pair too were sold too young almost died and the lady spent over 1k to keep them alive, at this point she re-homed them with me, bigger cage, better diet etc.
One pair I think is from Suncoast. They didn't have time for them anymore so I got the gliders for free with accessories (mostly from suncoast).
I got another pair from a rescue, most likey PP babies too. Jen Bailey Railroaded them for me. It shocks people when I explain I have never paid for gliders, just their medical. (UM isn't that expensive enough? Cage 120 wheel 50 fecal 45 exam for 2 100+ or so...)