Bev, being the cheapie that I am, I just go to my local hardware and have them cut a piece of plexiglass to the size I need. Find that I can get any size I need for a project for very few $$. Used one to square up a 22" block last week and what an easy proposition that was - spent a total of $2 for the "square up" ruler, didn't pull out any of my few remaining hairs and probably will have it cut down to a smaller size now that I'm finished with it. If you need any markings on it, just use a fine point Sharpie and away you go. Might add that they now save the oddball pieces at the hardware just to see what I'll need next. They're glad to be rid of the leftovers in their scrap bin.