After all of the barbeques are over, don't throw away any of those hot dog and hamburger buns. You have two very frugal alternatives:
Wrap them securely and seal in freezer proof bags, freeze immediately.
If you will be using the rolls within the next couple of days, wrap and seal in ziploc bags. Then store in your microwave. The microwave acts as a seal proof barrier and keeps rolls and bread fresh for days longer than inside your cupboards.