I go to my local plastics company and they will cut whatever measurements I need using 1/4" or thicker acryllic. I don't mind that there are no markings because my templates are usually for a specific quilt block size. Also, these templates are accurate and much cheaper than what I could buy even with a discount coupon.
Before I found the plastics company I would draw my own templates on paper ... or print them on the computer and print them out - paste/glue them onto Xray film and cut the Xray film out and use it for my template. Now you can easily buy template plastic in various stores. Then I had access to free used Xay film. Actually I still have a lot of that left, as I prefer the acryllic templates more.
PM me and I can get you an estimate of the cost if you are interested.
ali