Update: got in contact with Garmin and they sent out a refurbished unit for free! They were a bit surprised that my 235 hadn't even made it past 2 years of use.
Correa de Metal para reloj Garmin Forerunner 235/630/620/735, correa de reloj de acero inoxidable, accesorios de correa de reloj con hebilla plegable|Correas de reloj| - AliExpress
TOPsic Garmin Forerunner 235 Correa, Reemplazo Suave Silicona Watch Band Deportiva Accessorios de Reloj Pulsera Ajustable Correa para Garmin Forerunner 235/220/230/620/630/735 Correa : Amazon.es: Electrónica
Refurbished Garmin GPS & Running Watches for sale | eBay