Vent sexing is very tricky, and very few people can do it reliably. Don't count on a vet, either - it's hard enough to find one who will even look at chickens, let alone know enough to do vent sexing. This is not something they teach in vet school. You're just going to have to wait.
Unless you are crazy like me and bug all your avian professors to teach you how. Except, it's pretty much like ultrasound, and still very much eludes me!
Your best bet is to just sell them straight run. I find more people are willing to buy straight run when there is a chance they are hens. Also, there is a livestock auction in Hackettstown you could sell them at. Let me know if you want more info on that.
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