Amazon is selling a $140 portable Bluetooth speaker for $40, and shoppers call it 'better than JBL'

TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. Summer is a season rife with cookouts, soirées, and backyard parties, which require music to set the mood or get people grooving. For that, you'll need a device that…