The xeox is £25 on amazon,last week it was £18
Speedlink XEOX Pro Analog Wireless Gamepad - Black
https://www.amazon.co.uk/dp/B008XPEH9O/ref=cm_sw_r_awd_BfXFvbFQ6J8SB
Its a 360 pad clone & comes with its own wireless receiver.
It has a switch on the back to swap between xinput (360/ms pad) & dxinput (for older titles & emulators).
In xinput mode its seen as an official controller & works flawlessly - games from the last 3 years support it natively.its rechargeable with a built in lithium battery which for me lasts 3-4 days on a charge.
Build quality is not quite as good as a 360 pad but its plenty good enough.