When my children were young, we saved our change all year long in a big jar. In July each year we used that money to buy fireworks.
I have not done the $5 savings plan, but do put all change and excess $1 bills, whenever possible, in a jar to save for an emergency gas money stash. It does not take long at all to have $20 or $30 and it comes in handy to buy gas (or some other essential) when running short on $$ a few days before payday.








