Buy the $80 SP bundle and get an additional 500 SP, but the $160 SP bundle and get 1.500 additional SP! Don’t wanna spend that much? Buy the $10 ,$20 or $40 SP bundles and get a Mystery Item!!! Could be a mirror, book case or any other type of item! Check out this thread of the official forums to see what items other are getting when they buy the cheaper bundles!
Here’s what the Sims 3 forums user wickedlady1969 and others have received after purchasing a bundle.