If you buy hearing aids at Costco and you need your hearing aid repaired,  Costco will repair your hearing aid when its inside the 3 year warranty - no charge.  Outside warranty, after 3 years,  you need to contact your local Costco,  Some places will charge $135 to $250  This is for hearings bought at Costco - they will not repair your hearing aid if you did not buy it from Costco.