Porcelain tile. Sheet vinyl. Both require professional installation. Any floor that 'clicks' together will have seams. Seams have the possibility to leak. Therefore they are not water proof FLOORS. The INDIVIDUAL plank will be water proof...but the FLOOR (when planks are installed next to each other) will not be.

For a cheap option...sheet vinyl. There will be retailers that have ends that they would be happy to sell at a very low price and then the install would be relatively fast and easy as well (you won't "save" the price of install but you will save PLENTY on the price of the product = same amount of savings...just in a different way).

Good luck.

Any sheet vinyl or vinyl tile made for commercial venues would be affordable, durable and waterproof. However, vinyl tile should be installed with epoxy flooring adhesive for the job to be waterproof.

Absolutely agree with the above. I’ve done enough research to know that sheet vinyl, while it may be “out of favor”, it’s pretty much the best option for waterproof floors that won’t kill your feet and break everything you drop on them.

Cheap? Use a standard ceramic tile that has a fire glazing (most on the market come with this). Hunt for a tile that has a PEI rating (strength of tile) of 4 (commercial strength). The breaking strength of these are around 350 lbs per sq inch. To give you an idea of pricing, location matters, here in TX I have tiles as these for $0.99 sq ft.