Don't want to toot our horn, but we always have them for sale. They are about $1 less than the males and of course not as pretty. I don't know why you couldn't ask your fish store to order them. I don't think they are scarce.
I'm sorry, my question wasn't very clear. I have a few sources to buy my breeding pairs of bettas from, but I was just curious about being able to sell the females once we started breeding them since I don't see them for sale often around here.