Hagco microfiber cloths
I've been pleased so far with the Hagco microfiber cleaning cloths I purchased. I got the 14 inch square cloth. They come in various sizes and colors. You'll need to call them as their website isn't geared to retail customers. The shipping wasn't cheap, but the low price of the microfiber cloths themselves made it a good deal.
Be sure not to use any fabric softener when you wash them, none at all.