We get a RattyBox every couple of months. Frequency, for us, depends on number of rats and how quickly they destroy the hides or hammocks. They’re not cheap, but they’re worth it for some lovely cozy places, treats, and toys. if you have box-loving rats, the box everything is shipped in becomes just one more fun thing for your fuzzies.
If it’s in your budget— you’re in the States, so it’ll be cheaper for you than it is to get them shipped to Canada— definitely pick up a month or two at least. You can always pause the subscription one month at a time if you want to skip a month. You can skip multiple months is a row with no penalty, so don’t worry about being forced into boxes you don’t want.