Easy Bloods of Sargeras while leveling alts

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