you can make one yourself very easily.
1. get a butter tub or something similar about the same shape and size you want.
2. go to home depot or lowes and by a can of great stuff foam in a can and stone creations fleck stone spraypaint.
3. cover the tub with the foam and let dry for 24 hours.
4. either pull/cut out the butter tub or leave it in after it is all dry.
5. just paint it with the stone paint now and you will be surprised how well it comes out.
a can of foam is about 4$ and the paint is about 7$ you should have enough left over to make a few hide boxes
here is what it looks like, this one was made by captainhook2 who frequents the cage and habitat forum

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1.1 Gargoyle geckos
1.1 leucistic leopard gecko
0.0.1 asian golden tree frog
1.0 oriental firebelly toad
0.1 european firebelly toad
1.0 albino betta
1.0 orange tabby
0.0.1 asian painted frog
1.0 broad headed skink
0.0.1 fowlers toad
1.1 red eyed tree frog
1.1 red eared sliders
476.769.47 feeder crickets 