Dahlia - there is a BIG difference in the Aviantelligence cage and the ones you are showing on E-bay.
The E-bay cage is light weight and does not have a sturdy frame. It has slide up doors that can be dangerous for gliders if they fall on a tail or neck. Gliders can also open them to escape if not tied shut.
The biggest problem is the largest slide up doors are TOO SMALL to put a stealth wheel into the light weight cage. Any wheel you put in these light weight cages will rattle the whole cage.
The Aviantelligence cage is a great cage with two large doors that make putting things into the cage including stealth wheels easy. The large doors also make cleaning the cage much easier than the slide up doors.
Size and price are not the only features to look for in a great glider cage.