from a google search: "A 7 bone steak is a cut of beef from the chuck section of a cow's front shoulder, which is considered a tough area of the animal.". You're not going to find that in a regular grocery store because not many people will buy it. You will find every other cut of beef, pork, and poultry considered edible though.
You can go to a butcher but they're less common than a regular grocery store. Also, butchers usually have less selection since they're a smaller operation.
EDIT: i live in Dallas, Texas and "HEB" is just another brand of grocery store so "having to go to HEB" just means having to go to the grocery store.