Costco Price Cut: SteriPEN Handheld Water Purifier $39.99 by Rhonda August 10, 2020 Costco has the SteriPEN Handheld Water Purifier on sale for $39.99 (after manufacturer’s instant rebate), now through August 6, 2012. That is $10 off Costco’s regular price of $49.99. While supplies… 0 FacebookTwitterPinterestEmail