There is a surprising lack of "manly men" barefoot sandals out there but I think I may have found some. Check out this site: http://www.freewebs.com/barefootboutique/forhim.htm I'm thinking about getting this one, in black: Anybody have any other sources?
Try making them yourself. Some leather cord and a few knots is all it takes. See my pics for an example of a pair I made.