This item drops from Altairus in the Vortex Pinnacle on both Normal and Heroic modes. It also has a chance to be listed on the Black Market Auction House.
Here you can buy Drake of the North Wind for EU or US Servers.
You'll get guide for getting Drake of the North Wind
You'll be able to get Drake of the North Wind
Drake of the North Wind mount
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option