It's difficult to have walk in customers since we're not set up like a retail store and we are busy shipping etc.
We have a bunch of put together sharpening sets here that will work for you. Usually it's better if you use at least 2 grits. http://www.chefknivestogo.com/shstse.html
If you want 1 stone I would suggest a combo stone like this Imanishi combo stone.http://www.chefknivestogo.com/imtwosi1kst.html