Do you buy protein bars in bulk or as you need them?

I buy protein bars pretty often mostly Built Bars and I'm thinking about ordering enough to last me at least a month. The main reason is that checkmate found me a nice discount, so buying in bulk seems like it could save me a decent amount. My only issue is storage. I don't really have a pantry with a lot of extra space and I'm not sure if they stay fresh if I just leave a month's worth sitting around. For those of you who buy protein bars in bulk, where do you store them or any tips for keeping them fresh without taking up too much space?