The Vapor was my favorite cheap knife at one time. I have one I bought at WalMart.
I think there are much better options now. The Byrd Meadowlark (Spyderco) is similar in size and beats out the Vapor by quite a good margin IMHO. It's generally cheaper too! Search Google. Here's one link that popped up:
http://www.gpknives.com/item/spyderco-by...4e04bfcf1cd456cIf you want to buy locally, at WalMart, I'd pick up the Spyderco Native they have there instead. It's twice the knife if not more (but at twice the price).
The Kershaw is not a bad knife. It opens smooth as butter, which is unusual for a less expensive model. Other competition for the Vapor is the Benchmade Mini-Pika. I bought one of those at an Army surplus store for $21 a while back.
If I had to pick one knife in the inexpensive category to recommend to you, it would be the Byrd Meadowlark. If you want something a bit smaller, go for the Byrd Robin. Identical to the Meadowlark, just smaller.