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I can buy an additional two Gb RAM from Apple for $499.00 [....]As joemikeb has mentioned in the past,
"Apple is very proud of their RAM," which translates to "They charge too much!"
I've purchased RAM from
Crucial five times and have been totally pleased with their product's performance, as well as with their customer support and prices. (They offer a "Limited Lifetime Warranty" and free shipping.)
(I just took a look at their website, and I believe
this page is applicable to your Mac.)