3 Pack Nike canvas belts at Costco on clearance, $9.97, ymmv on availability and clearance pricing
I bought this 3 pack when it was around $15, and was a little annoyed that it has 3 belts and only one buckle, although its easily transferred. I almost took it back because I thought that was silly.
When I saw them on clearance yesterday for $9.97, I bought two more instead. Now you can get 9 belts and 3 buckles for under $30. Three colors, khaki, medium green and black. One buckle for each of the 3 colors, and 2 backup canvas belt portions for each color. Pretty good considering a nice belt like this is often $8-10 for one. They had another color pack with white, black and red. Can't see myself wearing too many white or red belts...
Here is the set at amazon for ~ twice the price. Good reviews except for half of them complaining about the one buckle.