From there, ask about Edge Sanders. You can visit your local Home Rental Supply Office and see what they have. I'm sure the mfgr's. name is all over the sanders and edgers! They may even have used ones for sale. You can try a Hardwood Floor Retailer too for input.
A few more sites are as follows: (Search EACH of the forthcoming WEB pages for the word, drum and then all over again for the word, edge)