The Logitech deal was posted a few days ago but i haven't seen anyone specifically point out that you can get this from it.
The logitech deal on amazon means if you add 2 of the items from the list you get 30% off both.
With this you can get the Logitech Proteus Spectrum gaming mouse (£51.99 on its own) along with the cheapest option there, the M185 wireless mouse (£8.29 on its own) which brings the price for both down to about £42.69.
Cheaper than just the Spectrum would be on its own, which even at £51.99 would have been a great deal as it's usually about £65.
With this you're getting the Spectrum for around £36 and the M185 for about £6.