What I buy is a completely baked, hinge-sliced 12" (4.5 oz) hoagie roll. They come packed ten 6-bags to a box. They come in different sizes . . . I believe that 8" is a common other size. You open the bag and thaw at room temperature for best results. We have actually thawed very successfully in microwave in a pinch . . . 1 or 2 at a time.
My cost is about 30 cents each right now. I could get that lower, but it is a great roll, and my foodservice guys don’t have lots of 12" options anyway. My customers are willing to pay for the added cost, so I use it.
“Best quality ingredients we can afford”