I know you said $20, but the Gerber LST is made of 420 stainless! You can do soooo much better. 420 is a soft steel that can be blank stamped (rather than laser cut like a hard steel). If you don't care about edge holding, then no problem, get one. If you do care, look for a FRN-handled knife (lightweight) with a good steel in it. I won't carry a knife with 420 or 440A steel. Forty years ago, it would have been passable for a stainless steel. Today, no excuse, except that it's very inexpensive.
EDIT: Well, one other good thing about 420, it's quite rust resistant. In modern quality knives it's sometimes used as cladding, on both sides of the quality steel in the middle. Now if rust is a concern, then consider a knife made out of H1 steel, which is downright rustPROOF. It has (almost) no rustable carbon in it!
OTOH, don't know if you can get a non-420/440 stainless for $20 or less.