Currently the only arena capable of holding spinners is the Robo Challenge arena. RR have previously created one from their heavyweight arena using 10mm polycarb, but as far as I am aware it meant that some of the polycarb used on the HW arena needed to be cut up or modified which means spending a fortune each event or ruining his larger arena?
RL have not mentioned having a FW full combat arena. Rebel Robots are currently building a HW spinner arena, time will only tell to how this works out for craig and HW spinners but I hope it all goes well.
The next closest is the DRG arena, which is also very good - a similar spec/looks to our arena but larger. Previously the arena has been a little bit small, but I have heard about plans to possibly make it larger?? If they run a large event It would be well worth going over, it doesnt cost a huge amount (they always come over here!)