ALL Weight Watchers Smart Ones are Buy 4, Get 1 Free through 12/11.  Most are priced at $1.80 OR $2.28.  You should be able to purchase 10 in one transaction and receive 2 free.  I haven’t purchased any myself, but there is no verbiage stating ‘limits per transaction’, so you should be able to buy as many as you want in each transaction.

Buy 10 Smart Ones $1.80
(you bought 8, so you’ll get 2 for free)
Use $4.00/10 – Weight Watchers Smart Ones Frozen Meals, Target Coupon – (target.com)
And use $4.00/10 – Weight Watchers Smart Ones – (eatyourbest.com)
Final Price: $6.40, or $0.64 each, when you buy 10

Buy 10 Smart Ones $2.28
(you bought 8, so you’ll get 2 for free)
Use $4.00/10 – Weight Watchers Smart Ones Frozen Meals, Target Coupon – (target.com)
And Use $4.00/10 – Weight Watchers Smart Ones – (eatyourbest.com)
Final Price: $1.02 each when you buy 10 total, Including 2 Free

If you’ve already printed the $4.00 off 10 manufacturer coupon, here are some others you could use:

$3.00/10 – Weight Watchers Smart Ones Product – (eatyourbest.com)
$1.00/5 – Weight Watchers Smart Ones Product – (eatyourbest.com)
$2.00/8 – Weight Watchers Smart Ones Product – (eatyourbest.com)
$1.00/4 – Weight Watchers Smart Ones product – (eatyourbest.com)
or $3.00/10 – Weight Watcher Smart Ones Frozen Items (Peelie on Select Boxes)