I've got to agree with those who are telling you to save your money. Although some decent, usable knives exist in the $20 range (SAK, Opinel, Vapor, Ka-Bar Dozier, etc.) I think you'll get a lot more satisfaction in the long run if you save your money for something better. For less than $50 you can get a Spyderco Endura or Delica, which have fantastic VG-10 steel blades, or for about $10 more than that get a Benchmade Griptilian, which has the awesome Axis lock. These are knives that will give you better performance and years of enjoyment. For about $100, you have even more great choices.
I started out buying less expensive knives, picking up one every year or so. I ended up with a drawer full of mediocre knives, none of which really did anything for me. I'd rather have one or two really nice knives than a drawer full of knives that are just okay.