I manage at Pier One part-time. Any coupons they issue are usually 20% off regular price. If the chairs on sale now, the coupon wouldn't apply.
The only exception is for cardholders... they will send you a 15% off anything coupon on your birthday month. The only other option is for Platinum cardholders, you get 10% your purchase the first Tuesday of every month. To get to Platinum cardholder status, you have to spend $1000 in your first year.
The P1 credit cards are a reward card; every $1 you spend is a point. Every 200 points gets you a $10 rewards certificate. They will do double points every so often and recently did triple points for online purchases.
As soon as you open a card, they will send you a 20% off regular price coupon. May be worth it to open the card, use the coupon on the chairs (if not on sale), then rack up the rewards points for the certificates. Sometimes they offer a discount if you open the card, but not usually.