Trying To Learn About CVS ECB's (Extra Care Bucks)

I'm still trying to learn about CVS Extra Care Buck$. The above was done in two transactions. I did O.K. and left with $2 in ECB's (Extra Care Bucks).

Head & Shoulders Shampoo (on sale and received ECB's): $4.99
Head & Shoulders Conditioner (on sale and received EBC's): $4.99 (FREE w/ B1G1 coupon!)
Stride Gum (received an ECB): 0.99 cents
Colgate Toothpaste (had coupon & received ECB's): $4.89

Sub-Total (before taxes): $15.86
Total Coupons: $5.99
Total Paid w tax: $7.89 (roughly a 50% savings)
BUT, I DID receive $2 in ECB's, so it's like I paid $5.89! :)

Whew! Couponing is truly a job in itself! But, to me, a FUN one! :)