At mine in the case near open briskets they do have packages that have 3-4 "racks" in one package. The smallest I've seen was a 2 "rack" package in the Halal section. That is normally what I get.
I almost went crazy prior to Memorial Day looking for Beef Plate Ribs. I don't have access to RD, so I called and visited several butchers and stores - I'm also in the Garland (Rowlett) area. The ONLY place I found them was at "Ye Ole Butcher" in Plano. I bought 3 racks (about 17lbs total, $8.99lb). They smoked up FANTASTIC!!! I rubbed them with hot sauce, then coated with black pepper and salt (maybe 65/35 ratio), smoked them with Oak (~250F) for 6 hours, wrapped w/foil, then pulled them off to rest when they became "probe tender". Just awesome!
BTW, many of the other butchers around here will TELL you they have Plate Ribs, and even try to sell you Chuck in place of Plate. If you ask them which rib numbers are in the rack, you can quickly find out if they're telling the truth or just don't know. Plate Ribs should be ribs 6,7,8 if I remember correctly.
At the RDs by me they sell them as a case OR by the unit. 1 unit is a cryovac with 4 plates - 3 bones in a plate. If there are no 'units' in the 'cooler case' (cases are on pallets on industrial racks and loose units are in a cooler style case....even though the whole room is cooled), I just grab one from a case bring it to a guy who works there who takes it, weighs it, and slaps a bar code label on it.
I usually buy a unit, cook two plates and freeze two plates for another day.
BTW, they also sell the 4 bone chuck ribs... don't let them steer you towards that. The guys who are moving product around there don't really know the difference.
What the difference between the 3 and 4 bone rack?I did my first ones and they had four bones and they were really good. Sorry for the hijack.
Sorry, but I gotta ask...why didn't you ask them when you were there?