The brush sets are released kinda sporadically in the UK. They can come with all sorts of brushes in and you tend to find one is geared around eyes & the other geared around the face. A set is often released at xmas but you might get them released with other collections too, such as novel twist.
To be honest though, the quality in the sets is never as good as that in the normal brushes so I guess the saying is true, you get what you pay for!