Fairly sure the MIG's were included in the price, but even if they werent, 2.3 Billion is still half the price of a new carrier of similar size like the Queen Elizabeth class.
2.3 billion was the ship and refit - migs were another 1bn on top. So, no, 2.3 billion for a ship that was over ten years old when deactivated and which sat a further eight years as scrap.
It's also 2/3 the displacement of a QE. I'm finding it very hard work to see this as anything other than a total feckup in procurement.