Take out ads and sell copies of “How To Quickly Double Your Money” by maddhatter717.
Seriously… ebay.
Here’s how, as I understand it. Disclaimer: I have not tried it, lacking the energy to do so.
Step 1: Go to a local merchant with a good return policy. Buy something rather discounted.
Step 2: List on ebay for a starting price of what you paid. Don’t forget to charge for shipping.
Step 3: Return what does not sell.
Repeat until done.
Craps table.
Bet on the shooter to lose.
Cut it in half. Each half will grow into a separate $1000 bill.