Like most Pokmon cards, the value of Seaking depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Aquapolis)
Sam's Club runs two types of restocks: Scheduled drops - announced in advance, often with a specific time and date Random drops - usually reserved for less popular or lower-demand sets Sam's Club often posts upcoming releases in the Highlights box on their site, like the July 21 Focused Fighters drop
Sometimes its the shine
While the initial release has already happened, the full roster of products has not been released Additionally, The Pokmon Company has announced plans to reprint this set and get another wave of items out onto the market for fans to pick up
Japanese Pokmon cards can be worth more when they have earlier releases, exclusive artwork, or better print quality