Best deal: $0.04 per count (43.9% below the median) — Mead #6-3/4 Envelopes, 3-5/8" x 6-1/2", Security Printed Lining for...
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Mead #6-3/4 Envelopes, 3-5/8" x 6-1/2", Security Printed Lining for Privacy, Press-It Seal-It Self Adhesive Closure, White All-Purpose 20-lb Paper Mailing Envelopes, 500 Count (742021)
Amazon Basics #10 Security Tinted Business Envelopes for Documents and Invoices, Quality Seal, 4-1/8" x 9-1/2", White, Pack of 500
HERKKA #10 Security Self-Seal Envelopes, No.10 Windowless Bussiness Envelopes, Security Tinted with Printer Friendly Design - Size 4-1/8 x 9-1/2 Inch - White - 24 LB - 500 Pack
#10 Envelopes Letter Size Self Seal | 500 Business Mailing Security Peel and Sealing Envelope | 100% Tinted | no 10 White Windowless Legal Regular Plain Envelops Pack | 4-1/8 x 9-1/2 Inches | 24 LB
#8 Double Window Security Check Envelopes, No.8 Double Window Bussiness Envelopes Designed for QuickBooks Checks - Computer Printed Checks - 3 5/8 X 8 11/16 (NOT for INVOICES) - 24 LB - 500 PACK