Where do you live? In Minneapolis, eggs are closer to $2.00/dozen (large, not jumbo) and milk is $2.99 / gallon.
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Those prices I quoted were from Wal-Mart in Pekin, Illinois. Until fairly recently, they were more in line with yours, possibly higher. About 6 weeks or so ago, I noticed them dropping steeply and not just at W-M but every grocery store in the area. The only thing I can figure out is that there may be a temporary glut of those products on the local market.
Too bad there’s no practical way to store milk and eggs, long term. Drying them is not a “practical” way, in my opinion
Best you can do with eggs is either boil or scramble, then freeze. Texture is ruined but nutrition remains.