As with vintage booster boxes, older tends to mean scarcer when it comes to sealed product, but there can be more variance when it comes to discussing price (though more recent sets tend to be less expensive to buy sealed product for overall)
If you want to run Behemoth K in Lightning/Fire, you could also use [11-018H] Sabin and/or [11-011R] Dadaluma to reach Damage 5 quickly or [5-086L] Cecil in Lightning/Earth who can deal you multiple points of damage in the same turn for a great combo
In the case of this card, is was awarded as a prize at Disney Lorcana Challenge tournament events, which means that its very rare, and very valuable
The woman, Neva, is being embraced by some legitimately unsettling figures
So my advice to you would be to wait rather than attempting to buy on day one at a hobby shop or even Walt Disney World and Disneyland