I've found glassine envelopes at coin dealers' stores. It's worth looking around your area for such stores before you import them. If you are ordering on line, both SIGNA and U-Line are good sources. You can also fold seed-tight envelopes out of plain pieces of office paper, and secure the edge folds with a bit of tape if needed. If you want instructions, contact me directly, away from this forum. I've found folded seed packets to work in a pinch many times. Cheers, Kathleen Kathleen Sayce PNW Coast, WHZ 8, dryish cool summers & mild wet winters