I 2nd this
Aside from Tarheel ants nests though, as they can get pretty expensive with the larger nests.
Great quality for a good price:
-Foranto
-Aus ants
-Some Etsy nests
-Drew's Dirt Boxes
-I would not recommend Ant Shack, or any other 3-d printed formicarium sellers. These nests are often overpriced, and ants usually prefer more natural materials anyways.
i 3rd that