Kaleidescape is the only service that legally sells (with no compression). A download of Avatar 2 here is roughly 85GB – identical to the disc. However, the hardware starts at $4,000.
A: Yes, but blank 100GB BD-XL discs are expensive ($15 each). You also need a compatible burner. It’s cheaper to just buy the real disc. Avatar 2 4k Blu-ray Download