Do you buy premade blank cards and envelops or your own?
I have done both. But, since I suck at cutting and I don't have a 12x12 cutter, I usually buy premade folded cards. They help me out so much. My favorite ones are the kraft ones.
I buy 8.5x11 paper packs and cut them in half and fold them to make a card. ETA, that with my envelopes I buy packs of 100 white greeting card envelopes for 4.88 at Walmart.