While I absolutely LOVE the business cards I sometimes order from moo.com (especially their mini moo cards!), I find that the cost is just more than I am willing to pay for something that I will end up giving away. At roughly 25 cents for each card, when I'm handing out 100 or more at each craft show, well, it adds up!
That's why I came up with a way to print biz cards myself, and for (darn close to) FREE!
I gather paperboard boxes (cereal, cracker, six-pack, etc.) from my local transfer station (or friends and neighbors!), open 'em up and flatten, and then use the nice big self-inking stamp that I got online at stampxpress.com (go to their 'eco-friendly' stamp section) to stamp my custom logo on the blank side of the boxes.
I've made THOUSANDS of these cards and my investment (if you can call it that!) was a $15 stamp and a $5 bottle of ink. Super easy, inexpensive, and best of all: RECYCLED! Which is, as you know, what I'm all about!