Ron Rennick

Uses a custom post type to allow editing of the promotion(s). The most recent published promotion post by date is shown below single posts.
Some (CSS tips)http://wpebooks.com/free-plugins/genesis-promotion-box/ for your child theme.
Requires the Genesis Theme Framework.

Genesis Promotion Box

This plugin allows you to add a promotion box after a single post in Genesis.

hideoguchi

Bluff Post is send e-mail plugin. for e-mail magazine, e-mail promotion. Support for WordPress members Welcart customers & Woo Commerce customers(Beta compatible), subscribe members from widget. 
You can deliver the mail magazine with a simple operation.
<h3>Code License</h3>
jQuery DateTimePicker plugin (http://xdsoft.net/jqplugins/datetimepicker/) 
License: MIT Licensed
Parsley.js (http://parsleyjs.org) 
License: MIT Licensed

Bluff Post

Bluff Post is send e-mail plugin. for e-mail magazine, promotion.

Genesis Promotion Box vs Bluff Post