What is Cost for upgrading MacBook Pro (13-inch, Mid 2012) ram from 4 gb to 8 gb?

In the US you can try Macsales (OWC)

https://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3_16 00MHz_SDRAM

You can also try Crucial.com for their RAM pricing which might be a bit less in cost than OWC but still compatible.

If your Mac is a Retina, you can't upgrade the RAM because it's soldered onto the system board.

You can try to going your nearby Apple Store, they should be able to upgrade your RAM for the price of the chip. You can try also an Apple authorized reseller/repair store. I went to one in Tucson called Simutek and they upgraded my late-2008 MacBook Pro from 4 GB to 8 GB for $50. It may cost more on a newer MacBook Pro though.

Important: If your MacBook Pro is a Retina model, the RAM CAN NOT be upgraded.

I have the same MBP mid-2012. I did an SSD and Ram upgrade.

Since you have the MBP open you might as well upgrade booth SSD and RAM.

I suggest a 500gb. SSD and 16gb of ram. Just max out your MBP for best performance it will costs you about $200

However if you want to do a minimal cost upgrade I suggest a 240gb. SSD and 8gb of ram, It will cost about $100

I used a 500gb. SSD beacuse I used bootcamp app and created two 250gb partitions for dual boot of OS-X and MS-Windows-10.

You will be very happy after the upgrades, I promise. My MBP just flies threw any task I have it perform. It works great.

For best performance SSD is more important than Memory

El Capitan requires a minimum of 8gb. or ram for good performace. 16gb. is better

Here is a list of parts

SSD - OCZ trion-150-series SSD

https://www.amazon.com/Toshiba-OCZ-Trion-Internal-TRN150-25SAT3-240G/dp/B01B4NUK MY/ref=sr_1_1?ie=UTF8&qid=1470689650&sr=8-1&keywords=ocz+trion+150

MBP Mid-2012 RAM

8gb.

https://www.amazon.com/Crucial-PC3-12800-204-Pin-CT2K4G3S160BM-CT2C4G3S160BM/dp/ B008LTBITY/ref=sr_1_1?ie=UTF8&qid=1470689595&sr=8-1&keywords=8gb+mac+memory

16gb.

https://www.amazon.com/Crucial-PC3L-12800-SODIMM-204-Pin-Memory/dp/B007B5S52C/re f=sr_1_3?ie=UTF8&qid=1470689595&sr=8-3&k…

Here are some how to video for do-it-yourselfers

https://eshop.macsales.com/installvideos/macbookpro_13_unibody_mid12/

To clone your hard-drive to SSD I used "carbon copy cloner app" ( Just down load and install, run as trial for FREE use ).

https://bombich.com/

You will also need a USB to Sata adapter

https://www.amazon.com/StarTech-SATA-Drive-Adapter-Cable/dp/B00HJZJI84/ref=sr_1_ 3?ie=UTF8&qid=1470690166&sr=8-3&keywords=usb+to+sata+adapter

And a torx-6 screw drive, small phillips and flat head screw driver

https://www.amazon.com/JACKLY-Professional-Screwdriver-Extension-Maintenance/dp/ B005JRTAYG/ref=sr_1_4?s=hi&ie=UTF8&qid=1470690234&sr=1-4&keywords=torx+screwdriv er+set

After you clone your drive to SSD and get it installed you will need to enable "trim" support for your NON OWC SSD

Open "terminal app" and enter this command "sudo trimforce enable" Select YES, YES and reboot when complete.

Also remember to reset SMC,PRAM, and NVRAM on your MBP

http://www.macworld.com/article/2881177/how-to-reset-your-macs-nvram-pram-and-sm c.html

Your total cost might be under $200 however it will be well worth it. Your MBP will perform like a NEW $2000 MBP

You will be very happy. It might take you about 1 hour to perform this upgrade. Mainly because the cloning process takes a long time. The actual hardware upgrade will only take you about 15 minutes to complete.