I was in the same boat. Hit the Lowes and smallest acrylic they sold in decent thickness ran around $17.00, and then a tube of Weld-on was $13.00. I called a couple of LFS to see if they would throw something together out of scrap, ( I needed 8X8X2 high), found one close that would do it for $20.00. So give a couple of your local guys a call and see what they might come up with.