I just thought of something else. I have a local shop that sells machines and fabric. I have to run the gamut of machines before I get to the fabric which is in an interior room with no natural light. It's clear what the owner is focused on but since I am seldom in the market for a new expensive machine but always looking for more fabric, I don't go there very often.
One other thing - carry at least one line of good thread. Something that can be used for both piecing and FMQ. There are lots of great threads out there but it's hard to be sure on colors, and sometimes I need it now. If you have decent thread for a reasonable price, you would probably sell a lot of it.