Your search for "mem-me3k-4gb" revealed the following:

Cisco MEM-ME3K-4GB ME 3600X / ME3800X SD Memory Card 4GB

SKU: NSH-3826
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco MEM-ME3K-4GB ME 3600X / ME3800X 4GB SD Memory Card

SKU: NSN-6046
Condition: New
Shipping: Overnight Options
Warranty: 365 days