Flash sale at the moment at ray-ban.com/ireland. Decent selection of styles with 30% off. They also have 20% off a range of other styles. Delivery is free. Deals are within the 'promo' section of the RB site.
You can either go their site directly and get above discount, however if you've a Supervalu Real Rewards member, you can get an extra 4% back (as Real Reward pts) if you click through to Ray Ban via the Supervalu eShop marketplace supervalu.ie/rewards/eshops/cashback/ray-ban-ireland