I asked specifically about Extra Bucks and $/$$ coupons and this was her reply (makes things about as clear as mud ;o),

Dear __________,

ALL Earned Extra Bucks coupons associated with an ExtraCare card may now be redeemed in a single transaction. The retail price must be greater than the combined total of all coupons. Please keep in mind there is no cash value back for any unused portion of the coupon. Please
remember that the use of manufacturer coupons remains limited to one per item in any transaction.


If you have any other questions please do not hesitate to contact us
either by e-mail or by calling (800) 746-7287. Thank you for taking the
time to contact us. I hope you have a nice day.
Sincerely,
Donna Roy
CVS ExtraCare