You might like to get Utter Chaos instead. Mauls are prone to randomly melting for no evident reason. Utter Chaos are highly variable depending on conditions, but sometimes look a lot like Mauls, and are generally hardier.
If you really want them, try Tidal Gardens, AquaSD, and the sale forums on here. Also, check SaltCritters- most of their stuff isn't labeled with a name, but you might find a Maul lookalike or some named Mauls.
Your garden looks really nice! Any troubles with anything getting smothered out by competition?