this is the reply that I received regarding my question of using in ad coupons in addition to manufacturers' coupons :

A,

Our corporate coupon policy is as follows:

All coupons must have a valid expiration date. Manufacture coupons are
limited to one an item. Rite Aid in-house coupons that begin with RC48 and
RC49 in the barcodes can be used with a manufacturer's coupon. Competitor's
in-house coupons are not honored at any Rite Aid store. Some manufacturers
coupons do not have a specific set price on them - it will be up to what the
item costs or a certain dollar amount and must be written in by cashier.
Internet coupons will only be accepted, if they are Rite Aid coupons printed
from our website.

Gwyn
Customer Support