Costco Sale: Medline Empower Rolling Walker $114.99 by Rhonda July 21, 2020 6/15/15. Costco has the Medline Empower Rolling Walker on sale for $114.99 (after manufacturer’s instant rebate), now through June 21, 2015. That is $25 off Costco’s regular price of $139.99. While… 0 FacebookTwitterPinterestEmail