GX Pokémon & Their Value!

[FierySplash]

The glamorous reveal of Lunala GX and Solgaleo GX got me wondering... What will these Pokémon be worth, will they be cards that are obtainable through tins, or will they be booster pack only?
What do you guys think the approximate value of these cards will be?

 

[bbninjas]

I would imagine these new mechanic cards are going to be just as rare as BREAKs and EXs. If they're good, then they'll become more expensive, but if they'll pretty much unusable, they'll sell for little.