I find it interesting that in the midst of the million-pound electronic products, there is a notebook (as in paper kind, not a laptop) costing £7.37. Rather confused as to how that gets there...
For those confused on the notebook, check the full seller list. Unfortunately, Amazon's sorting and filtering algorithms are non-obvious when multiple sellers are involved.
I especially like that the postage is £4.98 (why even bother adding postage to that price?), and also that the product description mentions how the watch is "affordable".
Probably pricing bots gone into some kind of boundary loop, which is a lot more interesting than a fat fingering entry mistake, and reminds us of algorithmic stock trading.
IT's not Amazon selling the item directly, its from the Amazon market place. Which makes it likely that when ever the merchant put in a price they made a mistake.
I think it's more likely that it's a result of their automatic pricing gone a bit haywire. I'd think that if the item was out of stock, it would automatically be marked as none available, not change the price to some huge number because you don't think anyone will pay that price. The link above does a pretty good job of explaining how their automatic pricing adjustments can get out of control.