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Newegg has my vote. In terms of brands there are lots of good ones out there. Crucial or Kingston are just a few.
 
I would go for 2 of these

they are especially tested on mac compatibility. (probably it would not make a difference, don't know exactly)

Makes no difference at all, it's the same thing, just more expensive.
 
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Hi guys I ended buying some local ram Strontium http://www.strontium.biz/products/memory-modules/notebook-memory/ddr3-4gb-1066mhz

from a store, was $40 USD or $50 SGD which was pretty cheap considering it was branded as MAC memory specifically, it came with lifetime warranty, and was selling for $69 SGD at another shop, so all in all I paid $100 which was WAY cheaper than Kingstons $120 SGD for Valuram or much more for the mac branded ones.
 
I would go for 2 of these

they are especially tested on mac compatibility. (probably it would not make a difference, don't know exactly)

Was this a mistake? That memory is for an iMac, not a MBP.
 
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