Go buy $500 visa gift cards from your local grocery store, head to Wal Mart (or another grocery store that sells money orders), and buy a money order for $500 less the MO fee (between .48 cents and $1 usually). Do this up to your CC limit, and invest. I’ve done this with CDs in the past on 15 and 18 month 0% APR offers, but never floated the money in the market.