Purchased at http://www.enhancedht.com/Merchant2/...ory_Code=MTFLT at $42.95/each, still sealed. Color Correcting filters such as this CC30R (Red) are important to get the best possible from your projector. You must devise your own method of attaching this filter to your projector lens. These are NOT the cheaper flexible "gel" filters. They are made from a flexible hard plastic resin and can be cleaned just like a glass filter. Filter size is 4 inches x 4 inches. $29.99 shipped. Please check my feedback on eBay under WynsWrld98 for confidence in buying.