Here is the knife I have that cuts very well. It folds, and is safe and easy to carry.
The Walmart price is about $10 however I got a box of them from another source for less.
http://www.walmart.com/ip/WINCHESTER-22-49435-Folding-Knife-3-1-2-In/40750376 If you actually use that knife you'll find its not much of a bargain.