We see them in the meat case here as well. Our price runs more like 8 to 9 bucks a pound.
What happens with my supermarket is they get the tri tip by the case, and you have to ask for it, cause they say no one knows what to do with it: so when the time starts running out, they slice it into "steaks" and put in the display case, and it sells.
I like to cook the sliced tri tip hot and fast on the grill. Just do not over cook, as they are usually thin.