Few nice high end Gigabyte boards at discount on the B Grade section of OCUK, still get warranty with the company after the 90 days I believe. Most of their boards have Thunderbolt 3 standard as well if you need for work.
Asus boards pop up now and again at heavy discounts but go quick!
ASRock do good quality boards for a lot less then others , bit buy from OCUK for the RMA side of things