Picked one up a couple weeks ago after some lusting, aprehension and some other things. Loving this "guy" so far.
If that source doesn't pan out give Monster Aquarium a call.I got mine from them a while ago.It's pushing eight inches now.Bummer! An LFS that has an online store had some. I only saw 1, but they supposedly still have 3. They have another location where they keep fish that aren't in the store.
https://www.aqua-imports.com/shop/product/harlequin-lancer-catfish-bagroides-melapterus/
Good ol Wetspot.I've gotten a few hard to find cats from them.Wetspot has them on their stock list as well.