I sculpted my own busness card digitally and engraved the steel stamping dies via CNC to make it like a coin. The up-front cost of making the dies is the biggest part of it (but not really for me since I make my own coinage dies). But once the dies are made, you can stamp a lot of them for a reasonable cost. Here is what my business card looks like:
It is 27mm in diameter, brass, and has a faint resemblance to the new US Mint President dollar coins
