This is the cheapest price for an SX120 so far. Its a 10MP camera with a 10x zoom. It takes AA batteries. It won't last long on alkaline batteries, but it does mean that you have the option of using them if you are out and about, away from a charger. You'll definitely want a set of rechargable AA batteries as well.
There is a beta version for the CHDK firmware, which gives a load of extra features (RAW output, more control over the exposure and manual settings, and running the camera from scripts). You can use this to take pictures automatically when motion is detected - eg for pictures of lightning or a bird table.
At the moment its listed for me as being available in store or for home delivery (which would be £5.95 extra).