Any hardware store, Home Depot, etc. It's a cotton buffing wheel with whatever mandrel fits your drill. The wheels are only a few bucks (I use 4" diameter ones, but anything will work), and you can pick up a cordless screwdriver for $20-$30 bucks. There's something to be said for using good old fashioned elbow grease, but this takes Uncle Mac's method into the 21st century.
^ Alden makes the NST, the shoe is made as a plain toe, then the stitching is applied so the bundling of leather could cause a slightly tighter fit. I had to go to an E width on this shoe just to fit into it. I mentioned this a little while back and got this information from Tom. What's funny is that the an E width on my NST shoe actually measures narrower than my LWB with a D width.