By number of books, the answer for me is simple: Baen's Webscriptions. I own the complete set. And that will continue unless and until my tastes and their publications diverge sufficiently to render them a bad purchase for me. This is, of course, skewed by the fact that each month's Webscription bundle is a heck of a deal in terms of cost per book.
By $ value of books, I'm not actually certain. Probably a combination of recommendations from my sister (for fiction), and references on a wide variety of blogs (for non-fiction). But this is skewed by the fact that the typical non-fiction book I buy is 5x-8x more expensive per book than the Webscriptions price I mention above.
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