$21 on the VC (SMB2j is $6)
Yeah, the $30 price tag include the "upgraded" graphics and sound, but also includes the artbook and soundtrack. And the ability to play it on any Wii at any time.
But if $30 is too steep for ya, next week, TRU has $10 off all Wii Mario titles - so it'll be $19.99 - if your nearest TRU has any copies left, that is.