With Amazon Prime Day iPad deals just over two weeks away, there's plenty of research to get underway. Working out just how much you should be paying for Apple's luxury table on Prime Day boils down to knowing this year's best sale prices so far, and the offers that were on the table 12 months ago. That's where we come in. We've been tracking Prime Day iPad deals for years now, and have been watching each of these models closely since release. You'll find each device's full price history below, and our hard-won tips and tricks for scouting out the biggest offers on the day as soon as they land.