I have 3 packs of these available bought from http://www.craftsite.co.uk/cardsenvelopes/id23.htm originally for £4.99 + p&p each.
The packs include 50 125mm x 125mm white cards & envelopes, 250gsm card and 100gsm envelopes, bright white, but very good quality. All packs are unopened. Will sell for £3.50 + p&p each or all 3 for £10 + p&p.
Sorry for huge photo. Decided to buy my stationery from vista print as I don't feel I'm creative enough to pull off a task like this! Xx