I just get them from Elusive Disc. I know I can find better prices if I hunt, but I get lazy and elusive disc never messes up my orders. I have had a string of bad luck with other vendors lately.
At the current release rate they dont come out too frequently that I need to worry much about overpaying by a few bucks.
Actually I think I'm going to get the Analogue Productions material from Elusive from now on, just because they have a perfect track record with me. Even if I have to wait longer.