iTunes movie purchases

Just today, I purchased a movie from the iTunes Store, “Some Like It Hot”. After I’d downloaded it, I became aware of an 11-film set of Marilyn’s movies (which includes the title I purchased). I would like to complete the collection, but I’m confused about something. If I purchase the set, will I receive the remaining titles at a discounted price... or would I be purchasing the first one for a second time? I’d like to buy them all, but I’m not looking to be overcharged. I know sometimes you allow your customers to “complete a collection”, but I didn’t see that as an option here. I spent $16 on the first purchase, while the full collection is listed at $70. If I wish to complete the set (provided you allow this), how much more would I be charged? Would I end up paying no more than $70 total, or how much would it be?