This offer is only for those with a Kindle with Special Offers:
Save $40 on select printers from Amazon.com
Click on offer, then click on the link on the offer page to receive an email with the promotion code. Sign-up for this offer expires on August 4.
You'll get an email (right away), a link to the Special Offer page and a promotion code to enter at checkout. Once you have the promotional code, you have until September 4 to complete your purchase. Like previous offers, this one requires you to use the full checkout process in order to enter your promotional code. Also, like all Amazon sales that use promotional codes, if you have a gift card balance, you must use it for the payment (if there is not a sufficient balance, then you can pick which credit card or other payment to use).
This offer can be used more than once per account, so long as you have more than one KSO registered. Just click on the ad on each device to receive the individual promotion codes via email.
The choices on this offer are a bit limited, but all the printer types are represented and by clicking on the individual links of the offer page, you can see all of each type of printer at one time. If you were about to replace a printer anyway (or buy one for a student going off to school), you could look at this as a $40 discount on a new KSO, if you don't already have one, so long as you get it 2nd day or faster and sign up before the deadline.
Combine this with the offer of $100 off a combined purchase of a Toshiba laptop and a Canon printer for even greater savings. Some printers will also come with an MP3 credit, as do a number of other electronics items (see list).