Dynex
Electronic and computer equipment such as televisions, Blu-ray players and storage media. Considered the company's lower-end private brand.
Geek Squad
Best Buy's computer repair service. Flash drives are also sold under this name.
Init
Storage products and furniture for home theaters. Seems to have gone mostly by the wayside; only two Init products (a table fan and a TV stand) currently show up on Best Buy's website.
Insignia
Electronic equipment such as televisions, tablets and home theater systems. Considered the store's higher-end brand when compared to Dynex.
Modal
Headphones and accessories for cell phones, tablets and tablets. It has a focus on more "hip" designs.
Platinum
Accessories for cell phones, laptops, tablets and digital cameras. Considered Best Buy's high-end accessory brand.
RocketFish
Primarily focused on cables for home theater systems, but also makes gaming and mobile phone accessories.