Easter Eggs - Eggsactly Puzzle

The Puzzle:

Easter Eggs - Eggsactly

Hungry Horace's just loves the blue Easter Eggs.

He went to the shop to buy one but found that the Easter Eggs had been packed up in boxes of three like this:

"How much does the blue egg cost?" Horace asked the shopkeeper.

"That's easy", he replied "It's just ....."

Then the telephone rang and he had to answer it.

HOW MUCH DOES HORACE'S FAVOURITE EGG COST?

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