Sirs:

I noticed your advertisement.  I taught commercial English overseas some years back and was a Soviet bloc weapons specialist.  The wording of your advertisement would make a better appeal to American readers if it used the word "inexpensive" rather than "cheap."  While technically your usage is correct, in common usage the word has come to mean poorly made or poor quality.  I'm just trying to help an entrepreneur.  Before I retired I farmed with Belarus tractors and now ride a Ural motorcycle.  Other than poor electrical systems (which I always replaced upon purchase), they proved inexpensive and indestructible.  dos vedanya,  Robin