While Rhythm Heaven Fever has been cheaper, this is the best price I've seen Fortune Street at. Plus if you happen to have a Fry's Electronics nearby, you can cut the shipping fees out to make it an even better deal.
Rhythm Heaven Fever - $9.99
Fortune Street - $9.99
I'm going to swing by a Fry's later today for Fortune Street, hope I didn't shoot myself in the foot for posting this before I went there.
EDIT: Wow that was fast, looks like its down to just in-store already