Purchasing TV show seasons on iTunes and limiting downloads

So this is a noob question as I've never bought TV shows through iTunes. I want to buy all the episodes of a season in one payment, but I plan to download in 1080p so obviously it would be nice not to have to download all the episodes at once. Sure, I could buy the episodes one at a time and it would only cost me slightly more, but there are also special features that you can't get unless you buy the whole season. Can I buy the season and then download each episode as needed? (I'm buying through my desktop Mac, don't have an iPad or Apple TV.)