Hi Barny,
The quickest and simplest way and I use this myself and have done for 32 years is to just add 1 to the number of selections and use that as my MINIMUM acceptable price.

The "correct way" ala Don Scott is to frame your own market and bet those that are your prices or better.

Too much mucking around in my opinion.

Good luck today.

Cheers and warmest regards
darky