I will advise you to BE CAREFUL who you decide to get a replacement from. There are going to be cheap knockoffs that are going to tell you they are indeed OEM and cost a tenth of the price of others.
THERE REALLY IS TECHNOLOGY IN THE SPEN... No batteries or wizbang stuff, but there is a tech to be had, that's why not all things work as an sPen. But, you will get what you pay for if you don't buy something that is at least a few bucks, probably no less than 15 after a while and more that 25 at the beginning... So just be smart with what you do.
I'm no hot chick, that would never work for me!