Where to buy grow tent fabric / liner?

I built myself a frame for a DIY grow tent out of PVC pipes and this frame measures 1mW X 0.5mD X 1.5mH. All that is left is to cover the frame with lightproof reflective fabric (black oxford fabric for back with Mylar for face). I don't like Panda film as an alternative.

I would like to know if there is an online store that sells fabric for grow tents?
Or maybe even a manufacturer that can make me a custom tent cover for my specific size frame and then ship it folded to me in a small package / envelope.

I live in a small European country and my goal is to save money and not to raise suspicion at the customs office. So buying a whole grow tent is not an option for me (too expensive, too suspicious).

Thanks for your help!

Look up panda paper,

3mm

Panda is too fragile. My cats would climb on the box with their claws and would perforate the liner in no time.
Need heavy duty liner that is backed with tarp or oxford cloth.
Something like this: