There aren't any "cheap" stackable enclosures that I know of. I think Animal Plastics is one of the more affordable options but they're still a substantial investment. You may not be able to buy them all at once but maybe you can save and buy one or two at a time. Most of your critters can fit in 3-4 ft cages so they'll be a little less expensive. I'd look into some AP T8s.
https://apcages.com/collections/terrestrial-cages
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