also, the sheath that came with your knife is what i like to call a "free sheath"... your cost was pretty much zero for that. don't like it? buy a new one.
KaBar in theory, WILL NOT, sell a knife without a sheath. so, there you go. unless you have a warranty issue, no new sheath.
a kydex sheath might set you back $30. leather? more. how more? up to $350 more from some makers.
enjoy your free sheath
okay. right... you don't like it. i'm sorry. sell it on ebay. that's right, people do that!
buy or make a custom.
"nobody likes the factory sheath"... did you buy the KNIFE, or the sheath? i often feel like i bought "the system". there was a golden era for factory knives with awesome sheaths. (eagle era imho). NOBODY sells a sheath that good. close, but, not close enough. the "tweeners" have excellent factory sheaths rivaling SpecOps imho, and CLOSE to Eagle, but ... not QUITE there. consider them free. however, you could sell one for $20 and not feel bad. many very expensive knives these days? customs? no sheath. no box. no nothing. yikes! what do these people do? buy $500 sheaths! and when they flip, they expect YOU to pay for it

go figure.