I got 7 chicks at TSC last week at half off $ because they where getting in new chicks and these where week old - straight runs. They let me choose the ones I wanted. I feather sexed them to try to get 6 hens and 1 roo. They had 14 but, 6 had long wing feathers and tail feathers started. The rest had short wing feathers and tail was just a fuzzy butt. So either I got what I wanted or 6 roos and 1 hen. lol
Last year I bought 2 RIR from the pullet bin and ended up with a hen and a roo.
Update: the above chicks (BO) are now 4 weeks old and I am sure now that I have 7 little hens and 1 roo