There's a lot of places you could get Dubia roaches. If you have a FaceBook I would recommend WestCoast Roaches or CNS Feeders.

https://www.facebook.com/westcoastroaches or website: Live Dubia Roaches WestCoastRoaches Live Dubia Roach Reptile feeder insects and supplies

https://www.facebook.com/cnsfeeders or their website:C & S Feeders