Taxi Taller

My grandson,3, recently became addicted to BBG, particularly one episode about a ghost. He was stricken when the episode disappeared. How often do they change? Does anyone know? Are these available on DVD? He really enjoys all the episodes and we like the tone of them. I see they were produced in Canada. Are new episodes in the works? We allow him to watch limited television, and this program seems to really engage him. His vocabulary is already extensive, and Big Garage enhances it. We hope the producers will come up with more children's programs of this quality. Bring on more. He talks to us about all the episodes, mulling the plot lines around in his head for days.