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Can you get a 2.8GHZ 15" Antiglare at an Apple Store?

Maybe. I've seen antiglare at an Apple retail store but the selection was limited. I wanted the 2.4ghz but they only had the 2.8ghz. You'd just have to call around and ask. I ended up ordering one online.
 
Yes. The Apple Retail Store has long since stocked a high end config of the MBP 15 with a high end CPU and high res screen. It now includes the 2.8 CPU
 
If its not available can one be ordered for you at the store? (avoid taxes)

Yes, but it will not avoid taxes. You pay whichever sales tax applies to your state. Are there any sales tax free states left? If you order online at apple.com, you pay the same taxes (calculated based on destination address, regardless of who/where its ordered from). Shipping is free.
 
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