Independent labels are a main force in keeping physical media alive as the major studios focus on streaming. Some of the independent labels have streaming platforms, too. These labels are a great source of films that would not be popular enough for the major labels to produce them. Many focus on horror films. They have also done a great job on foreign films and old films.
The Criterion Collection is the gold standard for independent labels. They also have a streaming channel. Criterion editions are expensive but worth it since they have great restorations and extensive extras on the discs. This July, Barnes and Noble has their discs for 50% off. They announce new discs every month on the 15th.
Kino Lorber has a wide variety of current and older films. They have frequent sales.
Shout Factory focuses on 1960s and later films such John Carpenter films and Hammer horror films.
Arrow Video is an English label. Some of their discs are not designed to play in the US. They have a wide variety of films from all over the world including a lot of horror.
Second Run DVD in an English label that does a great job of releasing discs of films from central Europe.
Vinegar Syndrome has done a great job on Rudy Ray Moore discs
Synapse Films releases a variety of independent films
Flicker Alley has released some great silent films
Well Go USA does a great job of releasing discs of Asian films
Powerhouse Indicator Films is a UK label. Many of their discs are not for the US market. They’ve done extensive fine Hammer reissues.
Funimation releases Asian films
Classic Flix specializes in old American films
Grindhouse Releasing has mostly horror films such as those directed by Lucio Fulci
SRS Cinema – underground movies
88 Films UK label
eBay has discs from Asia for Asian films that have not been released in the US. Be careful to make sure they play in the US.
Diabolik has a big selection of horror and other cult discs
The 3-D Film Archive has restored 3-D films. Some are Kickstarter projects before they are released on independent labels.
I’ll add to this list as I think of more labels.