I wouldnt suggest going for anything other than bonafide prescription hormones, though even they dont work for everyone. I paid loads for non prescription and saw no results at all, not even bigger nipps! but within 2 months of starting prescription (premarin) I saw effects and even though I eat next to nothing and lose weight like nobody I know, I've steadily budded and now my chest is unrecogniseable as male to be honest (when nekkid

).
As Hellfrozeover said though, if you intend simply to cross dress then you obviously are not comfortable enough with your transgender side to really go changing physically.
Personally, I'm happy being transexual and live as such: I live androgynously, dress androgynously, act androynously, probably spell terribly and the only reason i'll ever swap out my genitalia is for purely practical reasons rather than sexual motivation.
Give it some thought and decide on what you truly are before you jump into a fantasy
JJ x