In a Mega Sale situation, you MUST purchase 6 participating items (in this case) to get the additional $3 mega savings ($0.50 per item). So, for example you have a cart full of groceries, but you count only 5 items. A filler item is what you grab to get your item count up to a multiple of 6 so that you can get the mega discount on all of your items. Preferably something very inexpensive that doesn’t require a coupon, because if you had a coupon – it’s probably already in your cart!
(all prices valid through 2/2)
Don’t forget you can view the Mega Event full inclusions list HERE.