Costco Sale: MyCharge Razor Portable Powerbank $39.99 by Rhonda July 24, 2020 11/20/14. Costco has the MyCharge Razor Portable Powerbank on sale for $39.99 (after manufacturer’s instant rebate), now through November 30, 2014. That is $10 off Costco’s regular price of $49.99. While … 0 FacebookTwitterPinterestEmail