Seem like Wal Mart carries the Lansky system or one like it with their name. Not sure but worth a try. To me though, the Spyderco Sharpmaker is the way to go. If your knives are already fairly sharp the Sharpmaker can be used to touch up the edge and keep them razor sharp. Even if you do let them get dull, the grey stones can cut a new edge fairly quick. Not a bad investment to go ahead and get!
Btw, the 440C that Entrek uses goes threough several stages to bring out the best that this steel has to offer. Don't confuse it with the S&W knives claimimg 440C!