Since school has begun all over the country, I thought I'd post one of our strategies for teaching my son responsibility and frugality all at once.
When he started kindergarten he started taking a lunch to school every day. At the beginning of the year I put the sandwich, fruit, and snack in their own separate baggies in his lunch. His lunch also included a juice box. Each day, he threw away the juice box (whether empty or not) and all of the empty baggies.
As the year progressed, I realized that this was a waste of money. I could send in a thermos of juice and he'd bring it home along with any juice he didn't drink. That worked well.
But, what to do about the baggies? So, I started asking him to bring the empties home. He balked at first saying, "Nobody else does that!" Then, I came up with a plan. I would pay him to bring them home. The first year we did this each item had it's own value which totaled about 9¢, the next year he was pretty much in the habit and we just averaged it out to 10¢. This made payment much easier.
This year, we've upped the responsibility. Bringing home his lunch materials now qualifies as a "Red Chore". When he does not do this job, he has to pay me the 10¢!
This is definitely working for us.
You can also find more frugal ideas at LifeAsMom.