Chuck Engstrom, sanding simplified. October 2016
http://thesandingglove.com originator of the Sanding Glove, full line of abrasives and devices for sanding, oriented toward turners. Located on the Eastern Shore of Virginia, mom & pop business, great service. Pneumatics, Metabo, etc
http://www.2sand.com/ more industrial, with belts, etc. Located Gaithersburg
http://vinceswoodnwonders.com/ pretty well-known vendor of sanding supplies oriented toward turners, with turning tools as well. Wide variety of stuff.
http://performanceabrasives.com/ Ontario, Canada. I think they make the discs that Mike Sorge showed us a couple months ago.
http://www.woodcraft.com/ a familiar name to all of us. They have a store up in New Castle, DE for tax-free shopping. Extensive store inventory, more stuff online.
http://klingspor.com/ website says "The most sanding power for your money since 1893."
https://wvvw.woodturnerscatalog.com/ Craft Supplies USA, another familiar name.
http://woodturnerswonders.com/collections/sanding-items located Georgia, was at Lancaster. New item called "Sanding Taco" holds a 5" disc folded around it, looks useful, only $3.95
http://www.packardwoodworks.com/ also well-known, plenty sanding/finishing supplies
http://c.ymcdn.com/sites/www.woodturner.org/resource/resmgr/fundamentals/power__sanding.pdf article on making your own soft-discs.YouTube.com has a number of videos about sanding turnings.
http://fredwilliamson.comlPages-Methods/Sanding-Tips.html worthwhile info from a large-bowl turner. Current model Makita is GV5010, $99 Home Depot. A serious, thoughtful website throughout - check it out.