Some gear can't be found in Warmane web

[MarkHsiung]

Hey, could we add the neck 'Favor of Dragon Queen' in Store plz? Many of our friends want to buy it.

[Shred92]

Out of curiosity what do you want Favor of Dragon Queen for?

[Kovachut]

Out of curiosity what do you want Favor of Dragon Queen for?

I think the person is playing on Frostmourne. Those items are only relevant there.

[Seshollowaterboy]

It's also good for Herald of the Titans.

Edit: To OP, pretty sure it's not in the store because it's a quest reward. Most quest rewards aren't available to buy from store.