>>Does anyone know where I can get ferplast cages in the U.S.A.? All I've been finding is UK listings. A little help, please?

I'm sorry but I've never even heard of them until I read your post. I googled them & saw what you're talking about.
Martin's Cages has similar styles & I've also seen similar in mail order catalogs like That Pet Place & Drs Foster & Smith.

I would guess that these ferplast can't be found here yet?
Good luck with your search.
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PHRatz