DIY invitations Please HElp

I started looking for invitations the other day. Oh my goodnesss so expensive. For those of you who did them yourself where did you get your idea from, order the supplies, etc. Any help you could provide I would really appreciate.

Thanks,
Lisa

yes - cardsandpockets are GREAT!
also if you're looking for letterpress check out http://mercuriobrothers.com
super super inexpensive