Just got an email through again from sunglassshop.com with a 50% discount off a second pair of glasses. Use the code below at checkout. Don't think there are any limits. Hope it's of some use. TWICEASGOOD TERMS & CONDITIONS: Buy one pair get the second pair half price. This offer is only valid from Wednesday 11th January 2012 until midnight Friday 20th January. A 50% deduction will be made on the lowest value item in your basket in any one transaction. Only at sunglasses-shop.co.uk and sunglassesshop.com. This offer cannot be combined with any other offer. Not valid for cash or cash equivalent. No adjustments on previous purchases. Sunglasses Shop reserves the right to cancel or change any promotion/discount without notice, at any time.