Author Ad Network:
Use the coupon code FLASHSALE for $30 off the Author Ad Network package. 
Be sure to hit the APPLY button next to the coupon box and be sure the total changes.

HINT: The week after Christmas is a good time to advertise and think about running a discount promotion since people that received Kindles for Christmas will be looking to fill them up.

Can you use this deal for a book that isn't live yet? YES! 
There is a prepay option that you can use the coupon on if you would like to take advantage of the savings but aren't ready to promote your book. You pay for the ads now and I send you a prepay coupon that you use when you are ready to list your book.
This means you get the savings now and feature your book later. You can prepay as many as you like with the coupon below.

There are also discounts for prepaying for multiple promotions. This is helpful for authors with a lot of titles and for publishers that are promoting multiple authors.

Be sure to check out the complete list of sites here.