Critter nation: housing alternative for add on

Hi guys!

Here's my dilemma. I need to get an add on for the critter nation but it seems like every store online will not ship to Hawaii. (We have the poop end here) so I'm finding this extremely difficult. For some reason a ferret nation will ship here though. I'm not sure what to do, should I get a ferret nation add on or should I just get a different alternative? If you have any suggestions please let me know! I just need the help and advice I can get. I have one critternation and it has one occupying it and I have two baby chinchillas that need the extra room. Please and thank you ❤️