I'm no expert by any stretch, but I had the same reaction to the prices. The import marks on a few of them looked really large and placed near the rear sight base as oppose to the bottom of the barrel or somewhere else unobtrusive. I couldn't quite make out the importer, but it looked like someone out of Illinois.
For what it's worth, they seem to be selling though their limited surplus items really fast. Both Spanish 1916s and Swedish M38s went quick. They had run of the mill M48 Yugos that Aim has had in stock for months that they blew out in minutes. I think they've got MAS 36s and 49/56s coming up soon and I'm interested to see the pricing.