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The Scary Sharp system is, in general, the cheapest reliable method of getting blades sharp. It consists of getting a solid, flat work surface,
adhering abrasives (sandpaper, to begin with) to the surface, and working your blade over it with the cutting edge as flat as possible. By using progressively higher grits (harder, finer abrasives) a blade edge can easily be worked to a mirror polish.

Wikipedia has an article on it: https://en.wikipedia.org/wiki/Scary_sharp

Although there is a kit sold as Scary Sharp, it is entirely a manufacturer picking up an idea other people had. 

As for the knives themselves: there are a lot of terrible knife-shaped objects out there, but also a lot of reasonably-priced good knives, and of course a large number of expensive knives -- which might be good or bad. While you can assume that the very cheapest knives are not high-quality, above that level quality is not directly associated with price.