If you want a non-glass factory sheath I'd start by emailing Kabar (the email address on their website) to inquire about purchase.
Honestly though, while it's an ok sheath I wouldn't really want to pay much of anything for it. $15-20 shipped? Maybe, I might rather spend the extra $$ and get a nice kydex sheath.
May not be the answer you were hoping for, but as Bladite said, that's what you get with most knives.... an ok sheath if you're lucky.
I paid a lot more for my Fallkniven S1 and the sheath is really not that great. Does it dull the blade, no. Does it rattle, yes. Does it retain the knife, not very well. I had to mod it with a ranger band or else the knife would fall out if inverted. They also offer a leather sheath, just like Kabar.
ESEE knives probably have the best factory sheaths out-of-box, but you'll pay more in the first place. ESEE-6 will run you about $120, compared to ~$50 for the Kabar USMC or ~$70 for the Becker BK7.
But even ESEE sheaths may not make you happy. Want a MOLLE backing instead of the clip it comes with? Gonna cost you. Want a leather sheath? Have to go custom, gonna cost you.