Volume Discount on Serving Trays when you purchase 10 doz of 1 /2 & 1/2 trays at a time the cost comes out to $ 30.00 per doz or $ 2.50 ea for the 16 in Trays and 27.00 a doz or $ 2.25 ea for the 13 1/2 Trays. Avg cost is $ 2.38 ea per tray.