I had two go to knives for under 100 that worked for me. First, was the alaskan knives caping/skinning knife combo. I think I paid 110 for it. I have more expensive knives, but I still use the alaskan fixed blade set. I think it is a lot of knife for the money. I have cleaned probably 30 deer, 150 ducks, and fish with that set. Easy to sharpen too.
Then I bought a benchmade folder (690?) in 154cm. Since it is so easy to carry I usually always have it on me when I need it. The blade holds an edge super and it's easy to sharpen. The serrated part of the blade is especially useful when cutting bones and hide on deer. It zips through a breast bone. The serrated adds a new level of cutting on a do it all knife.
Both of these have served me very well.