HQ Brand Cages.
I do not sell cages at this time, but I am going to recommend a few brands.
HQ is one of the top brands out there. They are truly powder coated and never rust. There are many places who carry these cages.
I have used this brand before and the durability is fantastic. I have a few that have lasted nearly 20 years and still going with no rust at all.
Bastrop Cages in Texas does sell this model, which is good for a colony of gliders:
https://www.bastropcages.com/product-page/13221e-hq-tall-flight-cage-32-x21-x68
Bird’s Comfort sells a smaller model as well, good for 2 gliders:
https://www.birdscomfort.com/flight_bird_cage.html
As with the Critter Nation cage, you are going to have to make a few modifications before your gliders go in.
These cages are meant for birds, so please zip tie all of your small doors. You should only be using the large latching doors in the front of the cage. Sugar gliders are able to open any of the small doors, if they aren’t secured. You will also need to zip tie the wire grid floor to the stand, other wise they can try and pick up it. When they try to escape, the floor can come crashing down on them. As long as these modifications are made, then all will be fine.