The Primal Stormling pet can now be directly purchased from the Dragonflight pre-patch event vendors for 250 Primeval Essences.
The Primal Stormling pet rewarded from the Khadgar quest named A Primal Threat can also be purchased from Storm Vendors on live servers.
The pet can be caged and sold in the Auction House, I assume it will be worth more gold after the pre-patch event is over.