Where to buy 4gb ram for my Mid 2012 MacBook Pro?

"Where to buy 4gb ram for my Mid 2012 MacBook Pro?"

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Getting RAM for a MAC:

Contact an AASP:

Being that you are looking for older hardware, contact an Apple Authorized Service Provider and make a service appointment, seeing if they have (or can order) the hardware you need.

Contacting an AASP: 

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the Mac and its connections.

OWC is one well-regarded source: https://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3_1600MHz_SDRAM