kokinI'd recommend diamond, ceramic, or aluminum oxide stones.
You technically don't need anything special like the 'super steel' moniker would suggest - the general rule with sharpening is, "if it dulls your edge, it can sharpen your edge." When I'm breaking down cardboard boxes with knives, I also strop on the same cardboard pieces to make the edge last a bit longer. So the cheap stones from your local hardware will work, it just takes longer and wears out the stone faster.
You technically don't need anything special like the 'super steel' moniker would suggest - the general rule with sharpening is, "if it dulls your edge, it can sharpen your edge." When I'm breaking down cardboard boxes with knives, I also strop on the same cardboard pieces to make the edge last a bit longer. So the cheap stones from your local hardware will work, it just takes longer and wears out the stone faster.