I wouldn't get one of those Kritter Krawler things.. I've heard they can injure their backs if they use those...

Also, if the male and female are in the same cage at the shelter, the female will be pregnant, so it would be a good idea to get them fixed.

I really hope you are able to get them. Ratties are wonderful critters, and are soooo sweet.

I miss mine.

Good luck with convincing your parents..