You can thank me later for this one!
You can always get them free or cheap from Vistaprint or if you've ever given to certain charity's they send you free address labels constantly. I've given to some animal organizations and I swear I get address labels or some free gift once a month from them. I'm thinking stop sending me the free stuff and put the money towards homeless animals!!!! Anyway I have enough to last me a lifetime so I bring them along if I think I'll be writing my name and address a lot.