I went to my local glass cutter (got plexi glass) had about 15 templates from a 12.5 inch square to 4 " triangles and the shapes of all the speciality 45 and 90 degree angles I studied all the high $ ones that are advertised i had him cut me a 26" inch 2.5 wide ruler BC i made a lot of 2.5 inch strips and had them all cut for $34.00 ... less than 2 would have cost me. I did find a rough edge or 2 not many but used a piece of sand paper to smooth it
Then Thanks to another quilter here found out I could buy plastic grid sheets I use double side sticky tape to apply mine are all marked now just like purchased ones
I saved lots of money eBay has the grid sheets cheap