I agree with bitrunner in that you might be better served in getting an newer AMD motherboard and processor to replace what you have - but to give you another option, NewEgg has a 1.13 GHz processor for $44 US +s&h (
http://www.newegg.com/app/ViewProduc...114-163&depa=0). It is a socket 370, so make sure that it matches your motherboard.