I visit the "Boutique Custom Card Shop's" they almost always have a clearance box. These hold individual blank invitation paper (see the photo above) I find the pretty paper and make my own occasion cards. I just sign and write a personal message. I get comments like "where did you find this beautiful paper". It is personal and inexpensive. I get most of my paper for 10 cents each including the envelope. Dallas/ Ft. Worth readers my favorites are Paper Capers in Arlington and R.S.V.P in Colleyville.
I also buy holiday cards on clearance after the holiday and put in my card binder. I used large zip plastic bags no expensive storage bags.
Clearance scrapbook items also come in handy to make your own cards for those craft frugal girls!