Source for additional A-Frame brackets?

I have a pretty study two-tier A-frame stand that I’d like to set up all my gear on, which should be fine as far as weight and size since I’m just using one keyboard and three desktops (OT, A4, and BCR2000).

I only have four L-shaped brackets to use to hold the synths up. I could put a board on one tier and put all the desktop synths on that, but I’d prefer to have each unit have its own brackets so I can adjust them how I’d like.

Problem is I can only find one source for additional brackets, which are on sale for $15 each. Just wondering if anyone knows of any other (i.e. cheaper) options?

I’ve thought about trying to find a used A-Frame on craigslist or something and just using it for parts, but figured I’d ask if anyone else knows of any other sources.