I send out about 30-40... but I am on two card exchange lists, so nearly half of mine go through that.
This year I bought original unused Christmas cards from the 1940s and 1950s on ebay. I spent $35 for 150 cards, which I can use over the next two years. I had some good comments on them, so I hope to do that moving forward. I love the retro look, and they just stand out among most of the cards today.