"As Seen On TV"..... check Wall Mart, CVS Pharmacy, some grocery stores that have the new sections "As Seen On TV" items and you'll probably find it there, save yourself some $$$ in shipping.
We had one similar from Bed Bath and Beyond at the house. Worked OK, but eventually threw it away. Regardless of what the advertisements say, they stay wet and hold moisture that eventually has to evaporate somewhere .... in your camper ... not a good idea, especially since so many have problems with condensation problems on windows and walls the way it is. It's better to just let the water go down the drain and the bottom of your shower or tub dry quickly. At home, I perfected the tile shower floor better.