About three years ago I called Smoothline and asked if they ever offer Kappa group discounts and was told no. Reason being, dealing with people who'd say one thing but when it came time for the group to pay their deposits do another by backing out. That undermines the whole concept of a group purchase discount, and it's understandable from a business perspective.
Also, called a couple years ago around Christmas asking SL if they'd offer a Christmas special and was offered 10%, which I relayed to BB.
Finding this 10% off was just a coincidence. I had planned on order a top in several weeks so called to get a total + shipping, and was told about the sale. Problem was it was ending before I had planned on ordering, so I went ahead and pulled the trigger. 10% is better than nothing, but yeah, 20-25% would have been a great sale price.