As one of its daily deals, PricePlunge offers the Ion Audio Piano Apprentice for Apple iPad, iPhone, and iPod touch, model no. iCK05, for $24.99. Coupon code "SPRING5" cuts it to $23.74. With $4.99 for shipping, that's $6 under our mention from last fall and the lowest total price we could find by $11. This 25-key touch-sensitive keyboard is compatible with the 30-pin iPhone, iPod touch, and iPad. It operates on an AC adapter or four AA batteries (included). Deal ends today.