The same place that carries the rep-cal pellets at that good price also has a cave/basking rock that our dragons really love, they are heavy, large eoungh for the biggest dragon and only cost $6.49!!!
The dragons don't use the cave (babies do) but this is their favorite basking thing. Is also warms up and holds some heat from the lights. It holds a dozen babies with space for more.
We get the larger-mid size one(one down from the large), its almost flat, the really big one is domed shape. It also sits well in a pool of water and does not move, so they can bask on it outside, its the rock in the picture of the girls in the pool in the post about german giants
Basking stone/cave


