Are you considering buying the 6" Boba Fett and Han in Carbonite set? It'll be $45, but you can wait until the Boba gets released all by himself in stores in Wave 2 of the Black Series line and pay just $19.99 for him. The Carbonite Han, however, is strictly a Comic-Con exclusive item and there are no plans on selling him individually at mass retail.
It's a trade-off. Wait and pay less than half for the Boba, but you don't get the really cool and masterfully-sculpted Han. Go ahead and buy the two-pack set and you shell out exclusive convention prices, but you get both characters.