I set out to make my own R-Strap instead of dropping $60 on one. I am very pleased with the way it came out. I used a universal strap, actually meant for a rifle which was ~$5, a double-sided carabiner (I think it has another official name, but you get the picture) which was ~$2.50 both picked up at Bass Pro Shops, and a 1/4" eye bolt which was ~$.50 from Lowes. The great thing about it is that the strap is already padded and has the same padding design and feel as the lowe-pro straps I've seen.
The only down side to this setup is that the carabiner is a little bit smaller than the nylon strap is wide, so it doesn't slide up and down the strap, but this doesn't keep it from functioning like it's supposed to, I can still pull the camera quickly up to my eye from my waist, I just have to help the strap back around when putting it down. This could be solved by using a wider carabiner or hooking it into another adapter similar to what black rapid has around their straps. In the future, I will continue to adapt the strap and add pockets to it as well as trim the bolt down so it doesn't stick out so far.
For the cost and the money saved, I love it. It is very comfortable and easy to use! Take a look!