Prime Members only, ends 10/09. Amazon started many discounts on everything computer related for Prime Big Deal Day. Here's are direct links to the sale items broken up by category (and additionally by popular brand in some categories).

Laptops / Desktops / Monitors / Tablets: (see all sales)

• Laptops: Acer / Alienware / ASUS / HP / Lenovo 
• Desktops: Acer / ASUS / Dell 
• Tablets: Apple / Google / Lenovo / Samsung
• Monitors: Acer /  ASUS / LG / Samsung / 

PC Components / Accessories: (see all sales)

• CPUs: AMD 
• Graphics Cards: ASUS / Gigabyte / PowerColor
• Internal Storage: Crucial / Samsung / Western Digital
• Memory: Corsair / Crucial / Kingston
• Motherboards: ASUS / Gigabyte / MSI
• Other: Cooling & Fans 

Networking: (see all sales)

• Whole Home Mesh: ASUS / Eero /Netgear / TP-Link
• Routers: ASUS / D-Link / Netgear / TP-Link
• Other: Repeaters / Switches / Access Points