The turnigy TZ85A are sold out from all suppliers, and according to hobbyking, will be back in stock in 3-4 weeks time now.
The ranglebox ones are the same but programmed to run as brushed motor drivers.

Shakey ones are lower amperage but as shakey says shoudl; work if using the right motors.
Otherwise there may be some avaiilable soon.
Hobbyking ones will need to be programmed yourself or by a fellow competitor. not sure what other options are available.