We had a Dollar Tree open up nearby last year so I decided to stop in and check out the pet water bowls since having extras around is never a bad thing. I saw the ones in your link but wasn't too impressed as several on the shelf had cracks.
I considered these round black plastic bowls - http://www.dollartree.com/Heavy-Duty...?zipCode=60436 - but they smelled weird, almost like a chemical/rubber smell so I wonder if they offgas a bit?
I did pick up some of the large size melamine bowls - http://www.dollartree.com/household/...3610/index.pro - as they seemed pretty durable and are lightweight. Also the base is wider than the top, which should make them harder to tip over. They don't hold a ton of water, but since I check everyone twice daily and top off water as needed that shouldn't be an issue.