I don't have an "at market" possibility for opening positions, only for closing - no idea why TBH
Now obviously you can emulate a market order by setting your limit above the current bid, then it will essentially sell for the best price available at that moment
But but but, I don't want to sell at market, I want $6.1 or they can stuff it (well at least until later in the day)
Edit: I decide on the strike and expiry I want, then model it in OptionStrat, which gives the expected premium at various times of the day and SP prices, and I pick what I think it a likely dip or pop in the stock that yields a premium which I consider to be worth the trouble
Of course this is all subject to IV, which changes constantly, so the pricing isn't always spot on, but it's broadly correct and 9/10 when I set an STO limit I just need to be patient and it eventually hits, sometimes takes several hours, unless it look hopeless, then I'll adapt it a bit based on the intra-day support and resistance points
And just to add, sorry for so many posts this week - I'm off work and we were supposed to go to Copenhagen, but due to a family illness it got cancelled, so I've lots of free time