Most in-store meat rooms don't have a vac sealer, just a film sealer for packaged meats. These come prepackaged from the packing plant. You get them in boxes, let set for a day or two (usually hard chilled) - previous rec'd boxes rotated to the top anyways, and price and display, no other handling or processing required. Of course, they process a bunch for the retail case too.
You can process your own and seal at home (sounds like you've already got a sealer).
I need to do an instructional on pork butt processing, it will be my next project, need to buy some butts for sausages, buckboard, etc. very soon anyways now that some retirement money is coming in!