My Walgreens scenario

I am starting out with a $2.50 Register Reward and a $4 Register Reward from last week.

First Transaction
2 Tag Body sprays $8
- Buy one get one coupon $4
2 Herbal Essence Products $7
- $1.00 shampoo or conditioner
- Buy one get one coupon $2.50
1 halloween pencil as a filler or something small for about $.35

Total $6.85 plus tax

Use $2.50 and $4 Register Reward

Pay for small filler and tax out of pocket

Get back 2 $2 Regsiter Rewards

Second Transaction

1 3 pack Dial Bar Soap $1.99
-$.35 dial coupon $1.64
1 Blistex lip balm $2.49
1 Filler $.37 or so

Total $4.00 plus tax

Use both $2 Register Rewards

Pay tax out of pocket

Get back $1.50 Register Reward for blistex and $1 Register Reward for Dial

Third Transaction
I am going to see if I can do this but I am not 100% sure I can

2 Herbal Essence Products $7
-Free Product coupon
- Buy One Get One Free

Total $0 just pay tax

Get Back $2 Register Reward

Leave store with $4.50 in Regsiter Rewards for next week