www.sheetmusicplus.com is the big one, but their shipping is slow as molasses. I don't know of any better alternatives, though. They do ship worldwide and their rates seem decent.
I don't know much of anything about jazz or blues, but what's your level of proficiency? There's tons and tons of music for piano out there, but I could easily suggest something that would take an eternity to learn... or on the same tack, it might be something that's so easy it bores you to tears.