Go out and buy $600 worth of ammunition
That’s about a thousand rounds of 9mm. If you can find some easily. See some “australian outback” made 556 for $609 for 900 rds. Cash in some cans to make up the difference. Or trade a bottle of Jack.
Donate it to the state militia, i.e. someone who needs to exercise their 2A rights, if you don’t want to spend it yourself.