Most popular Google Shopping Special Offers

It's holiday shopping time, which means it's time to tell you the most popular special offers (and their promo codes!) appearing in Google Shopping ads (a.k.a. PLAs, or Product Listing Ads).
In case you haven't see our other Google Shopping posts on this subject, a great tip to boost your ad's visibility is to use the popular Special Offers field. This field lets retailers highlight specific promotions and sales for their listed products, not just the product's basic details.
Not sure what offers to run in this prominent field? Start by viewing the most popular Google Shopping Special Offers run by advertisers. Each day, you can visit this site and see the most commonly seen promotions running in the Special Offers space.
This week, we focus on retailers offering Free Products to entice shoppers. Let's look at an example in the skin care category from our ad monitoring software:

Which retailers should monitor Google Shopping Special Offers?
- Retailers who have a Google Merchant Center account
- Manufacturers who want to monitor how their approved retailers are appearing in search results
- Super-affiliates like Savings.com or RetailMeNot.com who want to see how their competitors are advertising
- Affiliate Managers who want to verify the product and offer compliance of their affiliates