I bought the ASUS Transformer when it came out. The thing I really found lacking with it was that you couldn't use a stylus (except for those rubbery mini dildos) so when I found the Envy x2 with a digitizer, similar to a Galaxy Note 10.1 I just had to get myself one. However, not any of the styli I own seems to work with the Envy. Does it require a specialized stylus? Something only provided by HP? I found an Executive Pen on their website, but I also began to look around and I'm not sure that model will work. What kind of stylus is required for the Envy x2? Is there some site that specializes in selling styli?