You can create a heirloom, enchant it with
Boon of the Bloodhunter
and mail it to your alt. You should get about 30 to 50 Bloods of Sargeras.

If you want to maximize your profit from these bloods from then you should check these links:

US:
Realm List - Blood Money



EU:
Realm List - Blood Money


› See More: Easy Bloods of Sargeras while leveling alts