The cheapest eggs on vons.com are $5.99 in Los Angeles. This is a cool data visualization but the closest data point it has for LA is Rosemead and it says they're $2.76.
Vons is generally one if the higher end grocery stores. It's not all that surprising to me that Walmart would have eggs at half the price. I don't live in SoCal, so I can't say whether it's accurate, but the number of people I hear complaining about egg prices around me while I can still get eggs at $2.89/dozen at my local Safeway has left me deeply confused about this whole event.
Now they're $4 minimum; normal "not insane sale" price before was $1.