Check out cold steel "oss" or the "osi" I prefer a single edged blade, but they offer both. The blade is 8 1/4 inch long , comes with a decent sheath and can be had for around 60$ on ebay.
I really really like that OSS, that will be the next one I buy. But for now I have a brand new Hen and Rooster that I need to use for a while first.
im waiting on one now