Seeing this gave me the idea to look up empty toilet paper rolls on Amazon, and they have lots of options! My gerbils thank you for both ideas!

[TP tubes on Amazon](http:// https://www.amazon.com/dp/B07SLV4R67/ref=cm_sw_r_cp_apa_glt_fabc_09128GEKK9PVRYZ0656W?_encoding=UTF8&psc=1 )

Actually a pretty good deal for 400 rolls, you can get 30 "craft rolls" on Amazon for $8.95 which works out to $119 for 400