How to Browse and Purchase TV Complete Series and/or Box Sets using Apple TV App

I frequently browsed through available boxed sets and Complete TV Series offerings for purchase on iTunes which led me to purchase many of them. Since the forced conversion to the Apple TV app I am unable to locate where I can browse the new series available for purchase as a box set. Where do I find both the newly released box sets and a listing of ALL available box sets of the complete series now on the Apple TV App? I would love to browse and purchase both for myself and for other family members and friends. Eliminating this option is most definitely costing Apple sales. There is no way I could afford to purchase at the inflated season by season rate being charged living on a fixed income during this economy, but the Complete Series price allows me to make multiple purchases of a variety of content.