Three months ago I started investing in 4k physical media...

It all started when my GF happened to find the LOTR collection on 4k for half price, had to buy it right? Well 3 months later and I count roughly 50 4ks on my shelf and more coming in.

Between Gruv, Amazon, and The Exchange I am getting easy hauls of movies. I'm shocked by the quality vs streaming, though I understand networking and compression well, I never thought that the quality would be THAT different.

So with that... Hi! Anyone have any other good sites to use to boost my collection?

Edit: Stop assuming "investing" means I am looking to make money from this. I am investing in my own personal collection. Not even sure why people keep assuming this is an "investment" when aside from this edit, the word isn't said in my OP.