UPDATE #2: Amazon is now sending out emails saying the digital price was incorrect and that orders are now cancelled:
The price for 1-2 Switch [Switch Download Code] (ASIN: B06WP39XBN) was displayed incorrectly when you placed your order XXXXXXXXXXXXX.
Despite our best efforts, with the millions of items available on our website, pricing errors can occasionally occur.
In our Conditions of Use and Sale (see http://www.amazon.co.uk/gp/help/customer/display.html/?nodeId=1040616), we state that where an item's correct price is higher than our stated price, we will, at our discretion, cancel the order and notify you of that cancellation.
Your order has now been cancelled. If you still want to purchase this item, please place a new order which will be charged at the correct price, when we dispatch it to you.
We're sorry for any inconvenience caused and hope to see you again soon.
UPDATE #1: Amazon has now removed the listing. Boo! Did you get your order in before this happened?
We'd imagine that this is a mistake, but if you want to put it to the test, by all means add it your basket.
Just note that as this is a preorder price, Amazon isn't obliged to actually sell you the code for £1.99 come launch day (Amazon's preorder guarantee means you get the lowest possible price if it drops between when you place your order and when it launches).
Still, 1-2-Switch for less than £2? That would certainly stop people grumbling about it not being a pack-in.
Let us know if you've placed an order by posting a comment below.