Well I called two places today. I found some glass called "museum glass" which is about $100 for the size I need 1/8 x 18 3/8 x 24 1/4. I also found a place that has "UV" protective glass for about $32 for my size needed. I am gonna look into museum glass and see why it's so special. I don't mind paying more for a special type of glass that will hold my most prized chips.