Congrats on your little sooty puff
Harold/Hera is definitely going to be one hell of a conversation starter in future!
I had a little look around for hamster cages for you which would be budget friendly when you guys are ready to upgrade, but hot damn, America is expensive!! If you guys are tight on budget you could build your own bin cage, and I know there's a Billy bookcase cage you can make too. I think I read on what of your posts that you have a cat so whatever you end up doing just make sure it's super secure!
Another potential option is an aquarium with a wire mesh lid. I think Petsmart, Petsco... Walmart..? One of the leading sort-of pets store sometimes have a gallon sale, so if you can wait it out you can pick up a 40 gallon for about $40-ish bucks. You'll have the space a hammie needs then, and also pretty cat proof too.