Your search for "MA-MNT-MR-13" revealed the following:
Cisco Meraki MR70-HW Wi-Fi 5 802.11ac Int Ant Unclaimed Outdoor WAP w/ Mounts
SKU: NSH-3942
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 179.99
• 5 in stock
Call if you need more
NEW Cisco Meraki MR70-HW Wi-Fi 5 802.11ac IntAnt Unclaimed Outdoor WAP w/ Mounts
SKU: NSN-4947
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 292.99
• 35 in stock
Call if you need more
Cisco Meraki MA-MNT-MR-13 Mounting Kit for MR70 Series Access Point
SKU: NSB-8727
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days