Mutton

Ihave spent my adult years in ohio and colorado. Seeing pictures of BBQ mutton got me thinking. I have never seen mutton in a store or resturaunt. Ive had many legs and chops from lamb but never mutton.
Seeing a picture of pit cooked mutton. Rich and dark and falling off the bone. Ot got me to thinkin I hadnt even had braised lamb shank in many years.
Is it possible to get rack or rib/loin chops if mutton any where?
Would it be too gamey to eat, ot maybe too tough.
I would think that with all the wool industry there must be older cuts than lamb.
britt