You could zip over to amazon.com...but I'd like to convince you not to. Instead, buy from Book View Cafe. There's no need to give your business to the 800-lb gorilla that seems bent on putting everyone else -- including our favorite indie brick and board bookstores -- out of business. You can download any of BVC's publications to your Kindle (or Nook) (instructions here).
Second, it's much better for you. You purchase a subscription that allows you to download in as many different formats as you like. Once downloaded, the files remain on your devices -- BVC can't "pull the plug," the way they did with Orwell's 1984. If you chuck your Kindle and go for a Nook, you don't have to pay for another download.
Third, you'll find original as well as reprint books by seasoned pro authors, all professionally edited and beautifully formatted (unlike a lot of the ebooks out there!) Some of these are not available anywhere else.
Not sure? You can read sample chapters of all of them to give you a taste.
(After you've downloaded and enjoyed your copies, you could sneak over to amazon.com and leave a short review, of course.)