I'm not sure if this is even possible, but it's worth a try.
Sell 20 December SPX 1330 puts - SXYXF
Buy 20 December SPX 1320 puts - SXYXD
Credit of about $.40
Total credit and profit potential of $.40 ($800). Maintenance is $20,000. The market opened lower and is now bouncing back up. Sometimes strange things happen on expiration Friday. There is still very little premium out there. Let's see what happens. One thing we know for sure -- you ain't gonna get it unless you ask for it!
Good luck and be careful,