I have a couple 40 gallons I don't need but we're nowhere near each other
What you can do that is affordable is get a couple of these, cut some holes out of the top, add hardware cloth with dollar store zip ties ($50-60 total for both):
Target : Expect More. Pay Less.
or these
Target : Expect More. Pay Less.
or these
Hefty 113-Qt Hi-Rise Clear Latch Box, Teal Sachet Lid and Handles - Walmart.com
Look on craigslist for fish and reptile supplies. 40 gallon breeder tanks are great!
I would also suggest looking up the minimum hamster recommendations from:
https://hamsters-uk.org/content/view/29/
Hamster Housing : The Humane Society of the United States
The UK has higher standards on a lot of things, hamster cage requirements happens to be one of them. Even the HSUS mentions critter cages to be too small as well as 10 gallons but their requirements are still a bit lower than I like.
My hamster stays in one of these with shelving on top for ventilation (I didn't pay $40 for it though):
Target : Expect More. Pay Less.
Not to mention cleaning small cages is a nightmare with the smell. My hamster was in a 40 gallon before and I cleaned once a month. I not sure how often I'll clean the Christmas tree bin but I'm guessing a few times a year with regular spot cleaning.
Aspen bedding works well as is cheap in bulk (I use paper based bedding as I'm allergic to aspen).