Chicken is pretty cheap, but I haven't seen brisket in awhile. I'm in the western Philly suburbs.
Just bought one for $0.99 a pound from the local grocery store this week. It's on the smoker right now. Sale price is regularly $0.99 a pound around here several times a year. Regular price is usually $1.49 to $1.98 a pound at Sam's Club in the 2 butt cryo pack. Absent a sale, I usually get all of my meat from either the local Sam's Club or Restaurant Depot. See if there is a membership club in your area and start there, plan "B" is restaurant supply warehouse.
I note you said yours are from "the local Amish market". You may be getting a different product that is locally raised, and not from a commercial "factory" farm. I know artisan meats have a premium price, but how does the Amish market meat compare quality wise to the chain grocery store meat? If you are getting an artisan product with higher marbling of fine layers of fat, that might explain the difference. It might be more from a heritage breed of hog also. The mass produced product we find at Sam's and chain stores is more of a breed that has been bred for rapid growth and less fat. The heritage breeds have very different meat and might also explain the price. I would do a little more research on what you are getting before declaring the price is overly high. Now if it's a cryo-packed Smithfield or similar product, it's way overpriced.