There are people within the forum who can make sheaths for you, or you can do a google search for "Rodent 4 Sheath". The bay has them sometimes too. I had Dwayne Puckett make me a leather sheath for my Ratmandu and he did a fantastic job for under a 100 bucks. That was over a year ago so prices may have gone up for his outstanding work. You can get kydex for a lot less than leather.
You can order which ever way you prefer, either email them, or just add to cart and check out. You will get a confirmation email if you purchase directly from their website and I'm pretty sure it'll get processed slightly faster if you just buy from the website. The hawks were a limited run, I'm not sure if they will go into production with them so I think you'll have to browse the exchange if you want one.