we do bottle drives for an 8th grade fundraiser. We make in average $1000 a year just on bottle returns. That pays for 1 1/2 kids to go to DC and all the graduation needs (cap, gown, yearbook, etc...)
I use mine for our disney fund. I cash in the slips and add that money to our disney bucket. I never use change to pay for things, I always pay with paper money and dump the change into the disney bucket.