Welcome from MN :-)
Alreadyaddicted, were are you from? :-)
I just got back from the Black Hills and I stopped at a few places along the way. I didn't get to stop at the ones in Rapid City but I stopped in Spearfish at the Dakota Quilt Company and bought some fabric there. It's so much fun to visit shops in other states, I usually can't leave without buying something(s).
FYI - If you aren't familiar with it, the big Sturgis Motorcycle Rally is August 3 - 9 so if you're traveling 1-2 weeks prior to that or the week after, you'd better check to see if you can get reservations. During that time your chances of finding a motel or campground with vacancies withing 50-100 miles from there are pretty slim. The area is saturated with motorcycles of every make, model, and age. Same with the people riding them. LOL It's really something to see, thousands of motorcycles.....literally everywhere.
Have fun and enjoy.