Depends on how old is it. I don't mind the second hand. When my kid was born, I used my friend's before I bought mine. Well, I bought mine because my friend's was a very good and expensive one that I didn't want to keep it everyday. If you can get a good one, you just need to boil the parts touch the milk.
If you are interested, please leave your phone number at good4mood@yahoo.com and I will contact you. We bought a brand-name model (the most expensive one from Toyrus) and used it only twice. The package is still orginal and you won't be disappointed.