Can anyone point me to the correct type of RAM to purchase for a MacBook Pro (15-inch, Mid 2009)?

I have a MacBook Pro (15-inch, Mid 2009) that recently had some problems and I was forced to reinstall OSX and ended up upgrading to Yosemite (I was previously using Mavericks). Unfortunately I did not realize how much OSX 10.10 would slow down my computer, so I'm looking to upgrade my RAM from 4GB to 8GB to help resolve this. However, I don't really have a good idea what type of RAM I need aside from the fact that it needs to be 1066 MHz. I was hoping someone might be able to point me in the right direction as to what the exact type of RAM I need to purchase or possibly link me to a site where I could buy what I require. I know some people claim third party RAM doesn't work as well as memory that is made and/or sold by apple but I would prefer to go with whatever is cheapest.

A 15" mid-2009 MBP RAM specifications are: 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM.
As has been pointed out, OWC is an excellent source for Mac compatible RAM.  Crucial is another first rate source for Mac RAM.  RAM from either vendor will work just as well as any purchased from Apple with the bonus of being less expensive and having a lifetime guarantee.
Ciao.

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    Typing the body of the thread message in the title, huh? -)
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    A 15" mid-2009 MBP RAM specifications are: 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM.
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    Ciao.

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