Recycled Plastic Envelopes 6"x9" - pack of 100 US $13.20, 10/US $100.00 Forest Saver Envelopes 6x9 US $0.45, 100/US $40.00 Envirotech brown clasp 6 x 9 40% post-consumer recycled envelopes - pack of 6 (19714) US $1.10