Where can you get the type ribs they serve at sonnys?

Hmmm - well, their website is non-existent right now

But since I've never heard of Sonny's I just Googled it. If you did that, you'd see that their menu says they sell St. Louis Cut ribs.

That's what you want to look for in the store or ask your butcher to provide..

OR - like many other folks here, I cut my own St. Louis style ribs.

There are a bazzilion tutorials/how-to videos on the net, dedicated to showing you how to take regular old SPARE RIBS (much, much cheaper than Baby Backs, ususally) and cut them into St. Louis style ribs.

Just Google "St. Louis Cut Ribs" or maybe St. Louis Style Ribs" and watch!

You can probably also find threads or vids on sites like this one...