Quote from inactionzip54:
If the bid ask is 20 cents wide and you are trading options intraday good luck using market orders.
No offense, if you think market orders are viable then it's pretty clear you have no idea what you are doing.
- The OP hasn't stated the strike they are interested in. But I see bid/ask as low as 2 cents.
- SPY option chain http://finance.yahoo.com/q/op?s=SPY+Options
- Limit orders in between a bid/ask of 20 cents have a good chance of going unfilled, the OP has to decided how important a fill is to them. I'm sure a few unfilled limit orders will get them thinking about using market orders instead.
- Market orders will get filled instantly, that is a big plus. I have never been filled at a worst price than the quotes but I have been filled at a better price.
- Any losses in the position will have nothing to do with using market orders instead of limit orders.

Would you want to play around with limit orders and try and save 1 cent on SPY calls today? Or would you go with market orders and get the job done?

actionzip54 ..... I don't see how you get "slaughtered by the bid ask" with market orders. You want to try and save a penny at the risk of not getting a fill? That is "penny wise pound foolish".
