if you have trouble affording 60$ BEFORE the mustang wait or insurance, gas, car problems 60$ isnt anything when it comes to a car bud.
legos would work. i know a guy with a 750 and a 100 gallon sump, way over stocked and he uses shot gun shells. make sure you clean them well.
of course it sounds like you dont need them anyway, so if it isnt broke, why fix it?