----------------------------Original message---------------------------- I have dealt for some years with: Conservation Resources International, Inc. 8000-H Forbes Place Springfield VA 22151 1-800/634-6932 They offer a wide variety of acid free and other conservation materials. They have an extensive catalog but do custom sizes for needed items as well. Their prices seem competitive. In March I ordered 150 Mylar polyester envelopes for maps @ 30" x 40" which priced at 2.34 ea. (3 mil), and, 150 acid-free folders @ 36" x 48" which priced at 2.60 each. I always ask for Livonia when I call as she has been particularly helpful. Hope this helps. Chris Ziegler