Black Friday Amazon deals: Price drops for Echos, Kindles and Fire tablets

When the cheapest Kindle e-reader drops to $50, it’s difficult to resist snagging one on an impulse buy. Appealing to our most reptilian consumer instincts is just how Amazon rolls, and—right on schedule—the retail behemoth-cum-hardware manufacturer is dropping prices across its product lines. Here are all the Black Friday deals for the Amazon Echo, Kindle,