All depends on the store. We have one that won't take any internet coupons (even had to get manager's approval to use the one from their own website that you got from being on their mailing list

) and we have others that recently started taking them (after quite a bit of consumer pressure I'm sure) but won't take BOGO, flat out free item, or over a certain $ figure. They have signs posted at all their registers and on the doors so it's not a rude suprise at the end or anything.
I would suggest you email the store or call the manager and ask for a written copy of their coupon policy and strongly recommend they start accepting IP coupons. Consumer pressure is the main motivating factor for retail/grocery store to change their practices.