There's a $5 promo discount for the SO Kindle Fire (of any variety it seems) that's applied when you watch the TNT Monday Mornings advertisement. Watch it, and click at the end.
From the subsequent email sent to me:
Your $5 TNT Monday Mornings promotional discount has been applied to your account!
To use your $5 discount:
1. Add one or more eligible items sold and shipped by Amazon.com in new condition to your Cart. This offer excludes Amazon.com Gift Cards and all digital downloads and content.
2. Complete your qualifying purchase no later than 11:59 p.m. (Pacific Time) on March 6, 2013.
3. The discount will be reflected in your Order Summary.
The offer is valid for a limited time only. Amazon reserves the right to modify or cancel the offer at any time. You must redeem the promotional code for the discount on your Kindle Fire or Kindle Fire HD with Special Offers no later than 11:59 p.m. (Pacific Time) on February 4, 2013. The promotional code and discount expire at 11:59 p.m. (Pacific Time) on March 6, 2013. The discount may only be used to purchase physical items, excluding Amazon.com Gift Cards and all digital downloads and content, sold and shipped by Amazon.com in new condition and must be used in one order. See full Terms and Conditions.