If you want to do it yourself just as well for very little $, we went to Lowes in Woburn and gave the glass/mirror cutter guy the measurements and he cut the piece right then and there for under $10 for a decently large piece (2.5x3.5 feet or so). We mounted it with Glazier's points (https://www.misterart.com/grouppix/280x210/1000/g1632.jpg) (available at Pearl Arts in Central and elsewhere).