Paper

You will need cardstock - plain & prints. You can buy individual pieces of high quality cardstock or the value pack paper at the local craft stores. For prints, you can buy packs or individual sheets. I really like the small 6-1/2" x 4-1/2" packs of printed cardstock. You get a lot of different prints with coordinating colors. Note that the scale of the print gets larger if you buy the larger size pack. They have packs in 8"x8" and 12"x12". I think the scale of the small pack is better for cards.

Don't forget you will need envelopes. You can buy "invitation" envelopes at the local office supply stores. They come in white or ivory.