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Cheapest place I've ever seen legitimately (where you get the sealed box, not some activation code only in an email that some guy has sold to a dozen people and will get revoked when Apple discovers it) is from L.A. Computer Company in Anaheim, CA.

YMMV
 
you are aware you can buy it on ebay from different people for way cheap right? I ordered it like 2 weeks ago for ~$35 :)

totally legit and the activation code worked flawlessly....did the same thing for my apple car on my macbook paid $90 for it :)

I bought mine a few weeks ago for $25 on ebay :)
 
It is cheaper on Amazon.

You're getting a discount from $99.99 so just buy it from Amazon.
 
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