A few weeks ago I was looking for a few branded items, happened to run across drink coasters at 4imprint. Minimum order is 500 at .25 each, free setup. Not cheap, but perhaps an interesting way to deliver a message. I’ve used 4imprint before with no problems, not affiliated with them in any way. Sample card below, and more information at http://www.4imprint.com/group/75/Coasters/product/1822-SQ-C/High-Density-Pulpboard-Coaster-Color-4-Sq.
I think they’d do well as an item to throw in an event bag, not sure people would like them as a business card replacement. As I’ve tried the half size Moo cards the initial reaction is good, then they all seem to say – literally – that they worry about losing it! These are considerably bigger at 4” square, but then you hit the opposite problem, won’t easily fit in a lot of pockets or business card holders.