You may want to check out a gerber basic. Its a nice knife that i edc'ed over a year, had a 4 way reversible sheath. Full tang & can be had for under $35 on amazon. The on with the last gerber symbol (sword in mountain) has a better sheath in my opinion, its easier to draw the knife. The newer basic that has the current gerber symbol has a more tight fitting sheath and i mean really tight instead of using your thumb to release the friction lock sheath the on the previous one i stated you actually have to hold the sheath while you yank the knife out. I remedied this by spending about 2 hours of shaving down the two "ridges" i will call them that you can see if you have the sheath in and and look in it.. Just spend the time shaving down the "ridges" with a nail file (one with a real coarse grit, a metal one) and it will come out really smoother comparable to the previous gerber basic i owned. Mine now has easy to release action and still has its friction lock hold on the blade. If you go this route just shave the inside, you don't need to take off either the gerber plate or clip.
Crkt dogfish neck knife, crkt minimalist series neck knives, crkt spew neck knife- these all come to mind and if im not mistaken all are under $40. Dogfish-about $25, minmalist-about $25-$30, spew-about $35-$40
that what comes to my mind right off the top of my head.