Hey mate ur probably gonna be hard pressed to find some1 thats made an extension for someone else to buy.. ur just gonna have to do it urself.. soldering isnt hard just have to borrow the iron and the solder from a friend. (if not buy one will come in handy again)
Im not sure what kind of wire you will need to buy, but i dare say doing this shouldnt cost more than $15 if u do it urself
good luck