Raspberry Pi Zero with 4/5-Port OTG USB Hub
Demonstration of a Raspberry Pi Zero with a 4-port On-The-Go USB Hub (sometimes described as a 5-port), available from various sellers on eBay for less than £5. The hub is connected to micro USB power, a keyboard, a wireless mouse (not Bluetooth) and a 5370 WiFi dongle. It backpowers the Raspberry Pi and the keyboard, mouse and WiFi work fine.
Note that there are reports of the 3-port version of this item not being compatible with the Pi Zero.