It was not available.
On Sunay Aug. 19 I came up with a strategy to rent the movie. Using the Redbox app on my iPhone, I tracked the movie at several different Redboxes. However, as I pulled into a grocery store parking lot two miles from my home to get an available copy, it disappeared. There was an option to reserve it if you sign in to Redbox, but since I was driving I didn't want to type and figured it would still be there in the few minutes it would take for me to drive there. Lesson learned.
Defeated, I came home and purchased through the cable's On-Demand channel for $5 instead of renting it for $1.29 at Redbox. Honestly, I probably spent close to five dollars driving around town for it anyways.
Out of curiousity I checked a local Redbox Tuesday morning to see if Hunger Games is still hard to get. Sure enough, it was unavailable at my closest Redbox. However, two other Redboxes within five miles did have a copy, at least for that minute.
Seems like others just chose the easy avenue of buying a copy. Hunger Games sold $3.8M DVD's and Blu-Rays in the first weekend.
You can also download it online from Lionsgate Video on Demand for $3.99 from this Youtube link.