Buy1 Get 1 Free coupons on a Buy 1 Get 1 Free sale are a YMMV thing.
However, this is how it would work at the store:

You take 2 the register. The store is giving you one and the coupon is your tender for the other. So the store will be paid for the coupon item by the manufacturer. You will find that many stores allow this. Sometimes a particular cashier will say no, but I have spoke with the manager at both my CVS, Rite Aid and grocery stores, and they all say it is totally permissible. You will find these scenarios on many frugal blogs. But most do say Your Mileage May Vary or YMMV because many store managers have the right to override policies.

So to summarize:
When purchasing a BOGO item you can use a BOGO coupon on the item. When an item is on sale for buy one, get one free and the customer has a buy one get one free coupon for that same product, the coupon will be accepted and both items will essentially become free (plus any applicable sales tax).

I hope that helps Stacie. Please email me if I can be of any further assistance.

Thats not their policy actually.

I use BOGOs on BOGOs frequently as do many others. That is why I said YMMV on BOGO coupons with BOGO sales. I don’t argue with a cashier though. I will just take my coupons and come back another time. I always run things by the manager at my Rite Aid before I do them as well.

They come out on Sunday.
As for is it possible to get that many coupons or Stayfree at the store.
My Rite aid today had a huge stock, talking hundreds. As far as coupons go, I buy the extras I need. It is a lot of stayfree – I have two sisters so split between us and my mom its only 6 packs a piece.