I just had a thought...as they aren't using technology...would you spray paint a cart or do something else?
Do they still use the postal system? You could send them letters, leaflets etc. But what would you want to advertise to them? Lol I can't think of anything. They make everything they need themselves, don't use technology and cut themselves off from the government, celeb life etc. I can't imagine what you could advertise that would actually interest them.. aha
Billboards in or near their communities, I would think. :) Maybe something that looks like it's hand-written and hand-painted would appeal to them more than the usual billboards we see in cities and along highways.
Sky writer! Brilliant!
I think when I get rich I'm going to rent a plane to fly a message over the Amish villages and towns just for kicks :) Tell them "I'm God and I command you to buy American cars..." :)
How about these:
Billboard signs Sky-writer Buggy-bumper stickers
Flyers brochures, and that car idea snds good
That's great... too funny...
