Xmas Cards

Hi, I am trying to design & produce some packs of xmas cards for our charity to sell in our charity shops, libraries and on our website.

I was wondering if anyone knew a good way of going about doing this.

Should I :

a) Contact a normal printer about printing cards and buy the envelopes separately

or

b) Contact a company that specialise in printing your card designs with charity logo on the inside & reverse and also supply envelopes, packing and stickers ready for us to sell.....does anyone know of any companies that do this?

Or does anyone have any other knowledge about this?

Thank you