Here's what I use. I get them from IKEA, they only come in black now, can't get the green color any more. But they're wicked cheap and are pretty sturdy. Only problem is that I have one bp that is 1200g but thinks he can fit underneath it. So he was always crawling underneath and spilling water. He gets a heavy ceramic bowl. But with everyone else, they get these. Work great and have no problems.

And they're only 50¢.



For smaller snakes, they can double as a hide: