Envelope Manager
Envelope Manager Software is a CASS and PAVE-certified bulk mailing solution that performs ZIP Code verification, sorts your mailing lists for first-class and standard Bulk Mail and allows you to design and print professional, envelopes, labels, and flyers.
http://www.envmgr.com/

Mainline Flatpacks Ltd.
Mainline Flatpacks Ltd specialises in Cardboard Envelope, All Board Mailer, Petavelop, Boardback envelope, peel & seal envelope, calendar envelope, Packaging, Boxboard carton, capacity glued folder, card cd wallet, pillow pack, folder finishing, Photofolder, Photo Folder, Courier envelope, luggage tag, magazine packaging, direct mail packaging, photomount, photo wallet
http://www.mainlineflatpacks.co.uk

Upper Hand Marketing, LLC
Handwritten marketing services including envelopes, letters, and sticky notes to help you grow your business. We also offer list service so we can be your one stop shop for all your marketing needs.
http://www.upperhandmarketing.com/

Ice3 Ltd
Cardboard engineers, design and manufacturer of 3D pop up direct mail, packaging and printed promotional pieces in paper, cardboard or plastics.
http://www.icecubed.co.uk/

All Things CDR
Sells equipment and supplies for CD-R recording including devices, media, labeling kits, cases, and mailing and storage envelopes.
http://www.allthingscdr.com/site/618533

Jet Envelopes.com
JetEnvelopes.com supplies all your special envelope needs, in square or announcement, booklet or catalog, jumbo or custom in stocks such as Classic Crest, Black Linen, Curious Metallic, Stardream metallic, Chartham Translucent vellum, Matrix Gloss, Wausau, Strathmore, and our new lines of Fox River and Gilbert envelopes, printing is available all our envelopes.
http://www.jetenvelopes.com

Viceroy International Forms
business forms, mailers, shape-a-lope, canadian and us cheques, report forms, window envelopes
http://www.vicforms.com/

National Envelope Corporation
Envelope Manufacturer. We produce stock and special make commodity and proprietary envelopes. We have more than a billion standard size and style envelopes in stock and are a major producer of special envelopes including custom sizes, printing envelopes and windows envelopes
http://www.nationalenvelope.com/

Sharon Paper Co., Inc.
Stocks a complete line of corrugated cartons and packaging supplies including mailing bags, bubble wrap, stretch film, tapes and packing list envelopes.
http://www.sharonpaper.com/

A1 Envelopes
A1 Envelopes: The Uk's leading supplier of blank ready-made and printed bespoke envelopes. Your first stop for direct mail.
http://www.a1envelopes.co.uk