I asked a question
Sorry, I wasn't clear. The $10 stacks with the 20% (and for that matter with the $10 from Living Social). The $10 don't stack with other $10 and the Y code 20% don't stack with the other Y code 20%. Below are some orders I just placed. Not 'free' but close to it!
Subtotal of Items: $36.60
Shipping & Handling: $18.70
Promotion Applied: -$10.98
Free Shipping: -$18.70
Promotion Applied: -$7.32
Promotion Applied: -$10.00
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Total for this Order: $8.30
And
Subtotal of Items: $32.33
Shipping & Handling: $20.68
Promotion Applied: -$9.70
Free Shipping: -$20.68
Promotion Applied: -$6.47
Promotion Applied: -$10.00
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Total for this Order: $6.16