Costco Sale: ECOPEBBLE Waterproof Bluetooth Speaker by ECOXGEAR $26.99 by Rhonda July 24, 2020 *UPDATE* 8/27/15. Costco has the ECOPEBBLE Waterproof Bluetooth Speaker by ECOXGEAR on sale for $26.99 (after manufacturer’s instant rebate), now through August 31, 2015. That is $10 off Costco’s regular price … 0 FacebookTwitterPinterestEmail