I watch the "dog food section" (mark down section) in the meat departments and get my flank, skirt, beef roasts and tri tips they are usually at about $3.00 Lb. I've seen flap steaks there also but have never tried one...yet.
For us it would be kind of hard to spend $7.00lb. for something like flap meat when 2 or 3 times a year Safeway has whole in the bag bone in ribeye roasts and cut anyway you want for $3.99 a pound same with T-bones that look more like porterhouse for the same amount.
We made some fajitas using a T-bone marinated and sliced thin they were excellent.