Not strictly a deal, but if you can't get a second Nintendo controller for your new Nintendo Classic Mini, then you can get one of these. They have much longer cables at 1.8 metres. The single grey ones are in stock as I write this, and the twin pack or black versions are due in on the 30th November.
Also you can get extension cables for the controllers here: https://www.amazon.co.uk/NES-Mini-Classic-Extension-Nintendo/dp/B01N2GAQVX/ref=pd_bxgy_107_img_y
These are 1.8 metres long, 2 for £8.99 delivered. I've ordered these.
Hopefully this will help someone.