I got my CABS sheath from Al Welke. $30, fast, and best quality in terms of material and fit. I'd definitely go this route if you're not scared of kydex scratching your knife.
I'll do some comparison pics between the Fallkniven S1, the Bark River Bravo 1, and the CABS once I have time. All I have to say for now is that they are all very similar in size and function (my functions, which may vary from your own). And I think the only thing I can possibly complain about is I like sharp spine edges and the CABS is rounded and very smooth. Oh, and it's pretty expensive too, for the few of us who struggle with the idea of $300+ knives that will eventually be broken, lost, or worn down to a nub.
Regardless, I still bid on another one last night on eBay (and was thankfully outbid) because it's a damn fine piece of equipment.