Here is a test page that displays 2 single product Etsy Seller widget ads in the same page.
This was accomplished by putting the widgets inside HTML iframes.

If you have 2 or more Etsy shops, using the iframes version of the widget will allow you to display multiple widgets in the same page. It also allows you to put the widget inside a post just like I did here.

*Note:
You have to be editing your post in HTML mode in order to use this widget in a blog post.

Features

• Automatically updates you listings every 15 minutes
• Mouse-over the image to pause scrolling
• Click on » and « to move to the next and previous item respectively.
• Click the Buy link to add the item to Etsy’s shopping cart
• Click on More info to view item in Etsy
• Written in Javascript (jQuery)