It turns out you
can get the Savic Plaza cage in the USA! Of course, I've only seen it on Amazon so far - a source some members(myself included) may be inclined to avoid.
https://www.amazon.com/Savic-Hamster...ef_=ast_bbp_dp
This is one of the most expensive cage options at roughly $200 USD. For about half the cost you can get the Kevin 82 for example which is roughly 80 cm x 50 cm, not to mention the potential DIY options for cages with more floor space. It is a good option to have on the market though!