I was going to print my own but the cost would have been the same as Vistaprint if not more expensive (cost of perforated business card paper + ink is not insignificant) and not as professional-looking, so I was going to go with Vistaprint for the cheap prices. But I spent a good few hours browsing flickr "businesscard" tag looking for card designs I liked and where the people got them printed (if it was mentioned). I found that Print100.com was named a few times by some of the people with really beautiful cards..not only the design but the whole thing. I went with them...they're based in China and the last time I used their site it was pretty awful and slow, but they throw in free shipping.

I got http://www.flickr.com/photos/chix0r/1409350187/ at around $30 for 300 - not the cheapest around, but I love the results (double sided 4 color plus spot uv varnish) and it arrived via fedex in something like one week since I ordered them. I got a bunch of the cards braille embossed by someone else (I deal with a lot of visually disabled folks) and the paper was decently thick for that. Maybe I'm more partial to them because I was really disappointed with the quality of the cards I got printed the first couple of times around (local shops in LA)...hmm, dunno.

I will note that moocards are adorable and awesome for casual uses..like my personal email and number, as opposed to my business contact info. Got a whole bunch for free before and the size is tiny but everyone loves them :]