As of 2014, Costco does not sell prepared, ready-to-serve deli trays. The store does sell trays and platters as well as packaged cheeses and packaged meats to make a custom deli tray.
Costco offers a selection of complimentary cheeses packaged together and selections of deli meats packaged the same way. These are not offered in ready-to-serve trays, but they are designed to be opened and prepared at home. They can also be mailed as gifts. During holiday seasons, packages are specifically labeled and offered for that holiday. Platters and trays are sold separately, though a cutting board is included in some special holiday selections.