You'd think that an internet retail behemoth like Amazon would primarily sell a lot of cutting-edge tech during the holidays, but nope -- that wasn't the case this year. The company has posted its annual holiday bestsellers, and it turns out that some of the hottest purchases were decidedly retro. The best-selling camera tech this year, for example, was Fujifilm's Instax instant film. A digital camera, the GoPro Hero4, was only a runner-up. Likewise, the top home audio gear was a Jensen turntable, eclipsing a Yamaha receiver and Sonos' Play:1 two-speaker kit.