Using discount code @https://www.vouchercodes.co.uk/zalando.co.uk?rc=4416707 for £10 off orders over £60. Seems to be a really good price for ultra boost in a nice colour way, and in a pretty good size run, too.
Quidco are offering 11% cash back on zalando purchases at the moment, and tcb 9.2%, so be sure to use one of your choice.
I got £15 off using discount code MTFMC4Y8 , but it appears to be a limited use code & not to be working any more.
Hope this helps, & Merry Christmas!