Why pay $320, or even $200, for a 7-inch tablet? Competition is driving down the prices of Android slates, including models from name-brand manufacturers. For instance, the HP Slate7 costs just $170 and has Android 4.1, a 1.6-GHz dual-core ARM processor, 8 GB of storage, and a 3-megapixel rear-facing camera. Not killer specs perhaps, but pretty good given the price. The Asus Memo Pad ($150) has similar features, only its 1-megapixel camera is front-facing. Maybe those rumors of a $99 Google tablet aren't so crazy after all.