When making charity cards you need to use a good quality card, otherwise it won’t sell, but at the same time you don’t want to use too expensive a card as you want to make as much money as you can for your chosen charity. I find the best ones are the 50 packs of cards and envelopes  which start at £4.99. This means that a card and envelope will only cost you 10p and, if you already have stamps, the cost of ink and colouring pens – both of which last ages and will be used for many, many cards.