With the SPX at about 1275, let's:
Sell 20 September SPX 1120 puts - SPTUD
Buy 20 September SPX 1110 puts - SPTUB
Credit of about $.55 ($1,100)
Market is moving. You may be able to get more or less depending on where the SPX is trading when you submit your order. Maintenance is $20,000. You may choose to wait for the SPX to move down further. Be creative, but don't be greedy.
Good luck, trade smart, and double check the option symbols before placing your trades.