The library, and my own bookshelf, usually.
Given how much e-books usually cost in relation to the restrictions on them, I find I usually buy works I've previously read and want my own copy of from trusted authors I've already tried.
For lower-cost DRM-free e-books like a lot of the backlist stuff that's been popping up, I'm willing to take a "sight unseen" chance if the author has a very good reputation/I've already read and enjoyed another work of theirs.
But generally, I don't pick up totally new stuff from an author unknown to me unless it truly is dirt cheap and I've tried a substantial sample and/or otherwise trust the imprint to have good taste and quality selection.
I never buy anything via the device, and always shop via the website.
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