Are you selling open cows? Or are you leasing the cows to have embryos put in?
Are the cows open for a reason or left open for the purpose of being a recep?
Have them had embryos in them before? How are their attitude and milking ability?
If you are selling open cows for receps and IF they are proven recep cows, I would say in the $1500-1750 range.
If they just open cows that came up open (and it wasn't the bulls fault), then I would say $200 over pound price.
If you are "leasing the cows" and caring for them and raising the calf till weaning (ok, I am making it complicated), I would say premium for the weaned calf.
I know I gave a complicated answer, but you asked a complicated question that has many variables!
(Hows that for a nice answer!!)