These are a few of the suppliers that I have sourced and used over the last few years.  I can recommend them all as being of high quality, competitive prices and excellent service.

Morplan  – Well priced but excellent quality literature display stands & holders

Stand Store – Good variety of floor and counter-top display stands

Westminster Wire – Smaller selection of card display stands, but better prices for stock items

Display Wizard – Exhibition display equipment

Lion – Framing supplies and gallery hanging systems – TRADE

Wessex Pictures – Framing & mounting supplies – TRADE

DIY Framing – Framing supplies

Transpack – Packaging including cello envelopes

Ideal Envelopes – What it says!  All kinds of envelopes in all sizes and colours.

Stiffy Bags – Excellent bags designed specifically for the storage and safe transportation of your artwork.  I have many!