I got my L239 years ago from Batfish Aquatics, back when they did more livestock. My guess is that HOT might get them in from time to time, but I don't see them in stores very often.
Batfish Aquatics has some nice plecos, If they're vending at this year's BFD I better get there early to see what they have. Maybe they'll have what I'm looking for
or maybe someone will enter some into the rare fish auction there