Amazon has a nice price cut on Fresh Shine 100% bamboo wash cloths, made without synthetic dyes. Bamboo is naturally antibacterial. These wash cloths are 10×10 and work well for yourself or little ones.
Currently, the blue towels are marked down the most, just $12.95 for 6 wash cloths. If you prefer a different color, you can get green or a multi-color pack for $14.95. Still a good price for bamboo.