I was perusing Amazon's Big Smile Sale Deal, and saw WoW Dragonflight Collector's Edition heavily discounted. This will not give you access to the latest expansion.
It has the following goodies:
*World of Warcraft Dragonflight Epic Edition Game Key: Use this digital key to unlock the Epic Edition of Dragonflight which contains Dragonflight-Level Character Boost (Level 60), Tangled Dreamweaver mount, Murkastrasza pet, Timewalker's Hearthstone toy, Diadem of the Spell-Keeper cosmetic head transmog, Wings of Awakening cosmetic back transmog ensemble, and 30 days free game time.
*The Art of Dragonflight - Hardback Art Book.
*Alexstrasza Mouse Pad.
*Dragonflight Five-Pin Collector’s Set.
Dragonflight content is available free for any subscriber as its old content now.
You’d buy this if you were interested specifically in the mount/pet/transmogs, and the physical stuff in the box.
You’d want to research if the DF character level boost is still valid as those aren’t good forever once the expansion is superseded by new content.