Thats interesting. I have a template on my computer, i print 6 slips to an A4 page, and just get them photocopied in bulk at local shop for 4p a copy.
Just got some business cards done by vistprint, not had them thru yet, but this is an option i will explore, could look more professional and easier. and they seem to be dirt cheap, so long as dont go for too many extras lol