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I've gotten two 27" iMacs from the Glendale Mall, but I guess the Grove is just as good.
 
MicroCenter (Tustin, CA)

They seem to always have instant rebates and the one thats been going for a while is $200 off a Macbook Pro 13 which brings it to $999. And they also have $50-100 off other Apple computers.
 
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