Since the last time we talked about this, I too have discovered jpc.de. It’s very expensive for specialist label releases, as Malte says, but it’s okay for standard soundtrack releases, and also for classical music. Their default prices aren’t very competitive, but they often have good discounts. Unfortunately, they stopped shipping to Norway last year because of our newish VAT rules (the store is required collect VAT on behalf of the Norwegian state).
Regarding Soundtrack Corner, I find their competitor Music Box Records to have lower prices (at least when shipped to Norway), and Intermezzo Media is even lower. Still, it often pays off to order in bulk from (at least some) US stores.