I think this is a pretty good deal... Amazon.es (Spain) are currently running the Fitbit Charge 2 on promo for €99. I have just ordered and paid a total of £97.01 INCLUDING Next Day Delivery to UK. Cheaper than I've found anywhere in the UK to date! Fulfilled by Amazon.
They currently appear to have all colours, all sizes, all running at €99. You can get this even cheaper if you happy to wait a few more days for delivery, at around £93 with Economy delivery.
Hope this provides helpful. Just ordered (8.30pm) and expecting delivery tomorrow! :-D