Hamido, just learn to sharpen freehand, as they call it. Contrary to what some would have you believe, there is no secret ritual or rocket science to putting a good sharp edge on your knife. You don't need a hundred dollar system that was produced to get the most of your money out of your pocket and into theirs.
Go to Home Depot or Lowes and get a Norton economy sharpening stone for the price of a beer or two at your corner pub. Then take some time and watch some videos on free hand sharpening. Thrers's lots of methods to use, the 'slicing the top off the stone' method, the 'Murry Carter Japanese scrubbing' method, the 'small circle' method' which like the Japanese method keeps the blade edge in constant contact with the stone. That's a good thing.
Don't get obsessed with angles, it don't mean squat. The media being cut won't know the difference if the blade is a degree or three off. This is one place where close enough is good enough.
Go over to the maintenance forum and there's lots of help there that will get you on the road to being self reliant on knife sharpening. The nice thing about learning to free hand is, you can sharpen up your kmnfe anywhere at anytime if it goes dull. Out on a camping trip, fishing by a lake shore, in a motel room. Sharpening a knife is more about technique in using what you have rather than relying on some high dollar gizmo that gets left at home because it won't fit in a pocket or in your wallet. Once you kern how to really sharpen your knife the "old way" you can use any smooth stone out of a creek, bottom of a coffee mug, side of a brick wall. Strop it on the back of your belt and you'll be good to go.
Freehand lets you carry small stone for sharpening in the field.
If you don't want to load down your pocket with a stone, then a small Eze-Lap diamond hone will fit in the wallet. Works on most knives no matter where you are.