> Do aggregators change prices based on geographic location of the buyer? The article mentioned an experiment with higher prices for OSX buyers.

They offer different products at the very least. CarTrawler is a car rental aggregator and they've found all sorts of geographic aberrations through AB testing (who's willing to pay for insurance, who prefers to see cheapest cars first etc). I'd be very surprised if they're not using hardware/software info to inform their offerings.