Welcome to Dollar Stretcher :)
If it were me I'd zest the oranges and freeze the zest, then juice them and freeze the juice if you wanted to buy a lot. As for the flesh there aren't many options without compromising texture. That's a really good deal, I would be finding a way to store as many as possible in the fridge. If you are able to find a cooler area of your home, or a garage, to store even more, you'd have to take into account how many you and your family would actually be able or want, to eat in that timeframe.
I'm going through a similar dilemma right now with asparagus. It is always 3-4 dollars/lb in winter months here (Texas). Typical price when it is in season is 1.99 to 2.99/lb. This week it is on sale at a local store here called Marketplace for 98.cents/lb. I went nuts and bought 6lbs, and there is just two of us. haha
I'm resigning myself to the fact that I just have to eat as much of certain produce when it goes on sale, and just look forward to the next sale.
Please keep us posted on what you decide to do re storing them. And feel free to toss a few through the computer to us. hehe