Win a $10 Walmart gift card from Mederma! Posted on October 21, 2016October 21, 2016 by Rosey Enter daily to win a $10 Walmart gift card from Mederma! All entrants will be entered into the grand prize for a $500 Walmart gift card. Mederma Contest Contest ends 11/4/16. Share this:FacebookPinterestGoogleTwitterEmailMorePocketRedditTumblr Posted in Giveaways.