Visited the towns of Intercourse, PA (the town commonly used in movies about the Amish, such as "For Richer or Poorer" starring Tim Allen and Kirstey Alley) and Bird-in-Hand, PA, a few years ago.
We did the tourist thing and visited the quilt shops and antique stores. Quite a few seemed to exist for the purpose of shaking down us English. High prices. Some were not even run by Amish... they just looked Amish on the surface, so tourists spent money there! Sick. If you see a horse and buggy and a woman dressed funny, she may only be there to shake you down. Buyer beware. The Amish masquerade party.
We got tired of that and visited a few true Amish shops off the beaten path (from a block behind the main drag, to many miles away). My wife wanted some cloth swatches for her own quilts, so we visited a few fabric stores. They ranged from having electric lights, calculators, credit card machines, and even electronic cash registers, to very non-technological... gas lights, simple kind people, and very reasonable prices, depending on where you went. Some even use plastic grocery bags (presumably recycled). I think, given the credit card machines and grocery bags, when it comes to doing business, they do have a lot of leeway.
Bought some homemade root beer from one elderly gentleman with a hand-lettered sign in front of his barn. It was meant to be read by a customer in a very slow-moving vehicle, I think, as it was only 8x10 inches. We had to back up and read it again... it was worth the stop. Farms around the area sometimes put out fruit and vegetables on tables and stands in the front. Never any people around, you just take what you need and leave money in a jar, on the honor system. Sometimes they don't even put prices on things... you just pay what your conscience tells you to and make your own change (which means they probably get about 10x what they would have asked if they had posted prices.)
A word to anyone visiting the area... get out and drive around the whole area. Get lost, then get found again. If you are out driving around Lancaster County and you don't see any other cars, but you see horses and carriages, you are in Amish Country. If you see more cars than horses, you are in Tourist Trap.
It's worth a trip. I hope to go again someday.