Yo Plus has a pretty neat offer going on. If you complete the required form and mail them a UPC from any Activia Product, they will send you a coupon for free Yo Plus! While you are there you can download a coupon for $1.00/1 Yo Plus.
Looking for ways to save on your Activia you need to purchase for your UPC? Here are a few coupons that you can find right now:
$1.00/1 coupons 8-9-09 SS, 8-30-09 SS or 10-4-09 SS
$1.00/1 printable here
If you watch your ads, many times Target or Walmart will put Activia on sale for around $2.00. So, for $1.00 you will get 1 Activia 4 pack and 1 Yo Plus 4 pack. Not too bad!