Bookase.com
Bookase.com is a book price comparison service, based in Delhi, India. Enter a book title, select the one you want from the results, and it shows prices, including shipping, for a large number of online book sellers. Worked well for the couple of samples I tried, though there was a layout problem in the results page, causing the result table to be offset to the right. Includes coupon codes to use for discounts, when applicable. No ads, except a couple of popular books listed on the home page. Appears that they make money with affiliate fees.
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ISBN.nu
You knew about ISBN.nu, right? Does the same thing, and has been around for years. It's what I've been using (almost since its inception) to link to books on my site.
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