Question about Vmax R93 Carvee Bee Performance

Where can I find tubes for the VMAX R93? I punctured the inner tube when inflating it! Indeed, when I pulled the valve of the front wheel to insert the inflation extension, it created a pinch at the base of the valve which ended up piercing the tube. I have to say that the valve is really "stuck" to the (front) wheel, you have to force it a little bit to be able to insert the inflator.