The coupon policy at Target doesn't restrict the use of a coupon on an item made free by a promotion, but remember that your store may refuse to accept it.
Buy 6 Lean Pockets, 2 ct $2.04, regular price
Buy Four Get One Free through 8/3
Use two B2G1 FREE – Hot Pockets or Lean Pockets Brand Sandwiches, 8 oz – 9 oz, up to $3.99 – (facebook.com)
And use $1.00/4 – Hot Pockets or Lean Pockets Frozen Sandwiches, limit one coupon or offer per guest, Target Coupon – (target.com)
And use 5% Off – Lean Pockets Stuffed Sandwich, Target Cartwheel Offer (exp 8/3) – (cartwheel.target.com)
Final Price: $0.78 each, when you buy 6USD