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

Cisco MEM-4300-4G ISR 4000 Series Router 4GB DRAM (2G+2G) Memory Module

SKU: NSH-8514
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 69.99



• Only 2 remaining
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Cisco MEM-4400-4GU8G ISR4400 Series 4G to 8G DRAM Upgrade Memory

SKU: NSH-7672
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 112.99



• 7 in stock
Call if you need more

NEW Cisco MEM-4300-4GU8G ISR 4000 Series Router 4GB to 8GB DRAM Memory Upgrade

SKU: NSN-7351
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco MEM-4300-4GU8G ISR 4000 Series Router 4GB to 8GB DRAM Memory Upgrade

SKU: NSH-7669
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days