Book bundles are one of the great features of the ebook format. It's technically quite easy to bundle several standalone ebooks together into a single ebook file, whether it's a collected teaser of your own works, all the books in a series, or samplers from a group of contributors. Some bundles are constructed for a limited time super-sale, and others remain permanently available at discounted but not giveaway prices.
Over the next month or two, I'll be releasing some permanent bundles for the series books in The Hounds of Annwn. The problem is pricing.
If someone buys all four novels and the short story collection at full price, it costs them $31.95. I'd be happy to sell that as a bundle for 50% off, or $15.99. It's a nice compromise between the number of people who buy all the series books, and those that don't.
The problem is, I can't do that on Amazon, since I'm severely penalized for prices over $9.99, even though it's to the reader's benefit. The best I can do is to offer the five-book bundle on other retailers and directly from my own website, and the two volumes of mini-bundles on Amazon, at $9.99. That's only a third off the full price instead of half off, but what else can I do?