I think there's something a bit misleading about these prices.
This is reporting prices of $2.76 per dozen at a Wallmart near me. I happened to visit that store yesterday and I know damn well there were no eggs being sold at even remotely close to that low price.
The Eggspensive site seems to be picking up on this dozen eggs, which happens to be not available at this or any other store in the region. They also are not available to purchase online. The site says they can be shipped in 3 days but it doesn't give me an add-to-cart button.
https://www.walmart.com/ip/Great-Value-Large-White-Eggs-12-C...
I don't know how it's scraping prices, but it should discriminate as to whether eggs at a price are even available.
EDIT: Actually, those exact eggs seem responsible for making most of Southern California appear to have insanely cheap eggs. Outside of getting lucky, this is almost certainly not the case. Go to any grocery store in SoCal and you'll primarily see eggs between $5 and $8, if not exclusively.
Nicely made site, though! Keep up the good work.