The rebate form was regional, and was found in the 9/11 Smart Source. You have to purchase one of the automatic shower cleaners or One-Step toilet cleaner kits by 12/31/11.
What makes this rebate great (besides the awesome plush toy!) is the 3 Target coupons that were included:
$2/1 Scrubbing Bubbles Toilet Gel
$2/1 Scrubbing Bubbles Mega Shower Foamer
$2/1 Scrubbing Bubbles Fresh Brush 2-in-1 starter kit
All 3 coupons expire 1/31/12 and can be stacked with manufacturer's coupons!