Colleen, I have three varieties. I agree, look around and learn what they look like. I bought one variety several years ago from an
online retailer. Stampede is a white knobby tuber, a bit rough to get really clean under a top that's about 6' to 8' tall. They have about a 90+ day maturity, better probably better for farther north. I found a white Fuseau in the woods nearby a couple years later. They're a smooth white tuber, easily cleaned under a 12' top with a 120 day maturity. That makes a rather tall plant for in-town! I live on a 1 1/2 lot. That's not a lot of room! The third variety is a Red Fescue that I found in a tiny flower bed in-town just last year. I got three tubers out of that tiny garden. I divided them for the first time last fall. They're red of course, not as knobby as the Stampede under a 7' - 9' top with a 100+ day maturity. I know of at least two more gardens in-town that have 'chokes and out in the country ... I can't even count how many places I've seen them growing. We took a friend to Sandy Lake, about 90 miles away, just below Erie, PA. to a blackberry farm. All along one side of the fellow's barn was a patch of them. I asked the guy if he knew what he had and he had no clue. He does now! I'm in DuBois, PA., west central part of the state and its hard to say how many varieties there are just around here.
So, again, learn what the tops look like, go out looking for them right now and remember where they are growing. They are a
native and decades ago they were very common. They are out there, you only have to find them. My Stampedes have stopped flowering and are starting to brown a bit. The Fuseau are in full flower right now. Keep that in mind. When the ones you find are browned, stop and chat with the owners and bum a handful of the tubers, or as much as you can and take them home. And if you've got the space, and you find more than one variety, GO FOR IT! Another great thing about getting what you can locally, they're acclimated! Plus, you won't have to pay up to $25 per pound! You won't have to do anything special to grow them! Just stick 'em in the ground and step back!
Remember that they will take over and conquer any garden patch you put them in, so plant them where you want them and nothing else for the long haul. They can be contained by regular mowing, so you can keep them from spreading, but it's difficult to mix them with anything else.
Good luck!
My wife and I like to can them, plain like potatoes, pickles, relish and in salsa. I'm thinking about drying some chips this fall and having a supply of chips that we can dust with herbs or spices for snacks and we'll also grind some for flour for flat breads. You can do anything with them. I've made wine from the tubers and the flowers. The tuber wine is stout, but it makes a great cooking wine! Right now, I've got a pot of French Onion soup cooling on the stove that has some English Thyme, Peppermint, a dash of Turmeric,
beef stock and a good portion of 'choke tuber wine. It is Fantastic!