Prime Members only, ends 10/09. Amazon started many sales on 4K televisions, smartphones and other general electronics for Big Deal Days. Here's are direct links to the sale items broken up by category (and additionally by popular brand in some categories).

Televisions / Home Theater: (see all sales)

• TVs:  LG / Samsung / TCL / Vizio
• Projectors: LG / Optoma / Viewsonic
• Streaming: Amazon / Roku
• Receivers: Denon / Yamaha
• Soundbars: LG / Samsung / Sony
• Other: Turntables / Mounts 

Smartphones / Wearables: (see all sales)

• Smartphones: Google / Motorola / Samsung
• Smartwatches: Apple / Garmin / Google / Samsung
• Other: Phone Cases / Chargers / Auto Mounts

Headphones: (see all sales)

• Earbuds:  Beats / Google / JBL / Samsung / Sony
• Over-Ear: Beats / Bose / Sennheiser / Skullcandy

Speakers: (see all sales)

• Bookshelf: Edifier / Klipsch 
• Wireless & Streaming Audio