Amazon have vouchers for between 40% off and 50% off much of their Under Armour Men's and Women's ranges.
You need to go to the Amazon vouchers page: https://www.amazon.co.uk/vouchers-coupons/b/ref=sv_uk_4?ie=UTF8&node=5522783031
and click to see all of the vouchers and then scroll down about 6 or 7 pages until you get to the 40% and 50% off Under Armour vouchers. Click to collect the vouchers. Click on the item and it'll take you to the page so you can buy it. Make sure you tick the 'redeem voucher' box.
I'll post some examples in the post below.