Clean received a limited theatrical release in the U.S earlier this year from Palm Pictures. Though I wish it was released by Sony Classics.

As for the other films on my list, I know you've seen A Scanner Darkly and Three Times. 

Somersault, Triple Agent, Buffalo Boy, Le Chignon d'olga, Exiles, Manderlay, Peep "TV" Show and The Forest for the Trees are all available on DVD in the U.S. right now. (I've talked about most of them on this site.)