I've had a few sebenzas and they are good knives, but I wouldn't buy another. They are too heavy and too blocky for what they are. I prefer spydercos these days. There are a few benchmades that are good such as griptilian and the new bugout. ZT and giant mouse have a few cool models as well. I like Spyderco the best though, different steels different locks and just a cool company that caters to knife enthusiasts. Military, police, para 2,3, native, etc. Sebenzas are ok...
As far as getting a really cheap EDC, I wouldn't, you want a quality knife, doesn't have to be expensive, but needs to be decent. You want a good lock and decent steel, you want a handle that is somewhat comfortable, all of that costs money. You can buy a decent folder for $140-$200, some are even cheaper. Know your laws though, some states might not allow concealed carry of pocket knives and then you have to have a pocket clip so that the knife is no concealed. For example in CA you can't carry any fixed blade concealed.