If you're looking for that niche release or just want a physical copy of your games, then PlayAsia is the store you've been hoping to find. If they don't have it, they've probably ordered it - and will get enough so you can get one as well. The website is well laid out, and searchable, so if you have even the slightest idea of what you're after, you'll probably be able to find it for a fairly reasonable price.