Wayfair offers Kearius Freestanding Over The Toilet Storage
 for $37.99 (orig. $54.99) with free shipping.

Product Description:
Stop worrying about running out of bathroom space worrying about messy toilets don't worry about lots of bathroom supplies and toilet paper toilet shelves can help you freshen up the bathroom and meet your needs. You can put towels, toilet paper, toiletries, etc. neatly on the shelf. It will help you organize your bathroom and save space.