Keeping a spare smartphone around the house can be a wise move. When a family member loses their phone, you have a decent alternative ready, because no one wants to use your five-year-old Galaxy. You also don't have to rush to buy an expensive replacement, but can wait for a good deal to present itself. The Moto X4 makes an excellent spare phone, and at just $130 ($10 below the $140 it had previously dropped to), it won't cost you too much.