I probably spent less than $100 on quilting fabric last year. I have been using my stash and trying to finish WIP's. It is really hard to resist buying new fabric. Best way is to stay out of the stores as much as possible.
DH never objects to my fabric purchases. He may think I'm crazy but he doesn't say so.
A thrift store near me has a $5 bag sale occasionally. Men's shirts have a lot of fabric and I can get 6-8 shirts in a bag. I buy wool jackets, pants, and skirts for a friend that way, too.