For those that have an Amazon Rewards Visa, you can use promo code KINDLE40 during checkout and you'll get 40% off on the purchase of a Kindle (no ads) or Kindle with Special Offers and any Amazon accessories for Kindle on the same order, up to $100 total credit. You can combine two or more Kindles on the same order and get 40% off of each, up to that $100 limit per order or just get accessories only. The Kindle with Special Offers works out to $47.40 using the discount. If you add the Kindle US Power Adapter (which no longer ships with the Kindle) to the same order, you only pay an extra $2, as you get both the 40% off discount ($8) and a $10 discount for purchasing both at the same time as the Kindle.
Note that the discount doesn't work on the Kindle Keyboard, Kindle Touch, Kindle DX or Kindle Fire. Still, this is a great discount on the entry level Kindle, which works perfectly well for most people who only want to be able to read.
It's not a coincidence that this sale comes as everyone is preparing for heading back to school. The Kindle is now a great choice for kids, as Parental Controls (including limiting access to the store, archives and web) were added with the last firmware update. I believe it is the only Kindle that currently has this option and, although it isn't mentioned on the product page, you can find out how it works in the online help pages.
At under $50, you may find that just getting access to free classics means you pay less total versus buying the paper copies of required reading for classes this year. And if the Kindle you are buying with the discount isn't for the kids, you can get a great start on your library with the $1 books I posted earlier this morning.
Be sure to use the full checkout process, not one-click, so that you can enter the KINDLE40 promo code and switch to your Amazon Rewards Visa for payment (the discount won't apply for other payment methods). You'll see the discounts in the summary box in the upper right corner of the final preview page, before placing the order. Those that don't have the Amazon Rewards Visa yet can apply for it first, then use it for the purchase (if the instant approval process goes thru).
Since I didn't actually place an order when testing how the discount works, I can't tell you if you can make multiple purchases and get the discount each time, but most of this type of promo code have allowed multiple orders, in the past. You may be limited, though to a single order, so I'd try to maximize the savings on the first order, before trying for a second order and discount.
