Just Kindle Books
http://www.justkindlebooks.com/authors-corner
$5 Off with Promo Code PAIDAUTHOR
One of the most affordable Kindle promotions groups available, Just Kindle Books has promotional options starting at $15, going up to a modest $35; even cheaper when you use the Just Kindle Books Promo Code PAIDAUTHOR for a $5 discount!
They already have over 25,000 Facebook fans, as well as a thriving email subscription list, but perhaps most importantly, they have recently merged with eReader Nation, so any promotion you run with Just Kindle Books will be run with eReader Nation as well, for no additional charge.
They are one of the few remaining promotions companies that will promote erotica, although they do have some guidelines and stipulations, which you’ll find on their submissions page.
If you want to try them out, make sure you use Promo Code: PAIDAUTHOR which will get you a $5 discount.