http://kershawknives.com/productdetails.php?id=2&brand=kershaw

I've got three, I think. This one is my favorite. It's a very small knife. I doubt price is a big thing but they are commonly encountered on sale at Walmart for like, $25. I don't know if this model is, as I got mine at Cabela's for $19.95 on sale. A lot of one-handed opening knives...don't. This one does and is very near a switchblade. You got to USE the lock on it as you don't want it opening in your pants. I kept feeling something rubbing me raw when I got my first Kershaw. I investigated and had blood on my thigh. Luckily it hadn't stabbed anything important, but that one now resides in my tractor full-time, for cutting baler twine. My other two have locks. Kershaws open EASILY.