It can be hard getting hold of cages right now. Not sure if it’s the same in the US - but there is a very good, reasonably priced cage that is good for Syrians called the Preview cage. It was priced at $60. It’s basically the same cage as the Alaska cage in Uk and Europe. Sold by Amazon. Right sized floor space, correct bar spacing , not too tall and comes with a shelf plus has a front opening door (good for interaction and taming with shy hamsters).
It’s this one - but says currently unavailable (same problem in the Uk - nothing available!)
Amazon.com
I just looked up the feisty ferret cage. It would need meshing. But it does have a full level half way up. This full level floor though is mesh so that would need covering in something solid - eg cardboard or hemp mat. Ideally hemp mat so it has some cushioning if the hamster drops from the roof. Then you would need something hanging - in the top part of the cage - over the access entrance from the full level to the bottom part of the cage (so the hamster couldn't fall from the very top, through the access part, through to the bottom). They can monkey bar across the roof at night and then just drop.
On the bottom part of the cage you could put cardboard inside up to about 6" high so you can have a good depth of substrate in it.
It's a nice cage and it is doable - but the meshing would be the tricky bit so it was safe from sharp corners etc and meshed on the inside. 1cm Square mesh is the usual, attached with cable ties. The cut ends of mesh would either need folding over (difficulty) or sanding so the cut edges are smooth.
Is it the same as this one?
PREVUE PET PRODUCTS Feisty Ferret Home, Black Hammertone - Chewy.com
Other alternatives are a 40 gallon breeder tank, detolf or bin cage.