I think it is also on a 3 for 2.... but will confirm this as i am going out tomorrow to get them for prese.
If it on a 3 for 2.... 1 works out at: 8.66 ... Bargain !!
from the website:
With Bop It you never know what is coming next! Can you react to the commands quick enough to beat your high score? Now with 1,000 levels and a new "Shout It" command! Play alone or with a group of friends and try the new "Party Bop" mode.