There are females available @ 30$/lb for Northern strain. I am picking up 125 of these in March. I will, of course determine 100% that they are female. These are 2yr olds and are (will be) ave 16".
The problem is it's takes some time to learn to tube these and it's still not 100% accurate on every fish, so in other words, you have to buy enough fish that you can be 100% on the number you actually need.