lynettechandler

This plugin lets you laser focus your banners, advertisements, promos and affiliate promos in relevant posts that you choose. When you put out a quality review or are talking about a specific product, people are more open and ready to checking out the product when you invite them to. Take it a step further. Make your call to action bolder or place a banner ad directly in that post instead of showing other ads that may not be relevant.
Features
<ul>
<li>Use HTML or Javascript ads</li>
<li>Includes the option to fall back to a default advertisement if no ads are found for that post (optional)</li>
<li>Automatically place ads before, after content or using widgets</li>
<li>For finer control, you can choose to use a shortcode to include the ad directly into your post</li>
</ul>

Single Post Ads

This plugin lets you put banners, advertisements, promos and affiliate promos only in relevant posts that you choose.

Codeless

Shop The Posts is a plugin created from Codeless that gives you the possibility to attach a product to each WP Post. 
So, if you have a small or a large one Blog Website, this plugin can help you to sell or just showcase products in blog posts. 
You can attach:
<ol>
<li>An External Product from an affiliate websit</li>
<li>Select a WooCommerce Product from your WP site</li>
</ol>
After the attachment, on each post (in the loop and single posts too) will be added this feature: 
1. In the Loop on Home Page or any loop element, will be added a small cart icon, that on mouseover will show the product attached 
2. In Single Posts will be added a fixed (sticky) part on the left/bottom of the page that will show the selected product.

Shop The Posts

Here is a short description of the plugin.  This should be no more than 150 characters.  No markup here.

Single Post Ads vs Shop The Posts