Cooling Pad is the cheapest and most simplistic cooling option for Laptops, the most i personally can reccomend is keep it ontop of cold hard services and don't use it on your lap, pillows and other soft furniture.
If you feel your laptop is dying to the point where you need to molest it to keep it running, it may be worth concidering just buying a cheap Netbook etc, which these days are 200 GBP or under if you're lucky.