A few years ago, I purchased 24"x36" sheets of buffered paper from Light Impressions. They still show the product on their website. But I hestitate to order from them since I was burned by them a year or so ago. Fortunately my bank card reversed the charges for the product that never shipped.
Does anyone know who made their archival buffered paper that I used as interleaving in my flat file? I liked it. It was 2.5 mils thick. Most of the paper that I find is only 1 mil thick