Using multiple WAN connections is one way of ensuring your internet connection is reliable, but multi-WAN routers can be pricey. Enter the £30 (ex.VAT) TP-Link TL-R470T+, which is a five-port router with four of its five 10/100Mbps Ethernet ports freely configurable as either LAN or WAN ports. I've written a short product news piece about it for ZDNet UK's First Take blog.
You get an awful lot for your money in this small box
The user interface has plenty of useful help, but it's a bit crowded in there