If you really want a great selection of flowers then make your own! It is quite easy to duplicate the Prima styles using die cut, punched, or hand-cut shapes and your own scrap papers.
I've had great success following the instructions on
Valitasfreshfolds blog (or take a look at my blog for a slightly expanded set of instructions). I also love the "Hot off the press" fold & stack flower template which makes a variety of 3-dimensional flowers.