I would like to suggest that if you do a lot of painting you could get your supplies for framing, lighting for display and stretcher bars at a substantial discount at
United Manufacturers Direct.
You can set up an account with a tax ID number and they are very prompt. It lowers your costs a lot. For example, screws, metal offset clips, mirror hangers (D rings), picture hangers etc. are all about 80% less. Same with Fredrix stretcher bars and it is where all the professional framers get their supplies.
If you don't have a tax ID number perhaps you can go in together with someone else or set up an account as a group.
Debbie