i think technically it is $150 more, since the only way to get the antiglare is with the hi-res option. definitely annoying.
Not true. Apple's retail stores often stock the high-end (high-res matte with the top-end i7) 15" model, so they can upsell. Not all stores will have it, and there's no guarantee (they typically only stock just a few at a time), but it's not online BTO only.