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Apple MD101LL/A MacBook Pro MID-2012 13.3 Inches Core I5 2.5GHz 4GB RAM 500GB Refurbished – Computechsale
OFFTEK 4GB Replacement Memory RAM Upgrade for Apple MacBook Pro 2.5GHz Intel Core i5 - (13-inch) (DDR3) (Mid-2012) (DDR3-12800) Laptop Memory
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Apple MacBook Pro: RAM upgrade (HowTo)
Apple MacBook Pro (13-inch, Mid 2012) - i5 2.5 GHZ 8GB RAM 240GB SSD | eBay