I work in a retail environment. If you are nice (and sincere, believe me, we can tell) we'll work hard to find you a discount. You have to ask, it is against policy for us to offer. Also, don't be lazy, pay the full price, then send your wife (husband) back to complain. It pisses me off and I will remember you next time.
Do your homework. What does your insurance pay for? If your Dr prescribes a nice, new name brand medication, you're gonna pay. More and more people have high deductible plans. Go on-line and see if there is a manufacturer coupon to go along with prescription.
On another note, I did book a hotel room with an AARP discount. Upon check-in, the clerk wanted to see my card, she was quite insistent, it was a nice hotel. I had left it home on accident, but I did actually have an AARP card.