Penny has been a fascinating card since her original release in the Scarlet & Violet base set, enabling you to bounce any basic Pokemon from the active spot or bench into your hand (and along with it all attached cards)
Vehicle commanders or artifact commanders will have an interesting and reliable artifact maker, too
You can obtain the Ho-Oh ex (Crown rarity) card by opening Wisdom of Sea and Sky: Ho-Oh and Wisdom of Sea and Sky: Lugia from Wisdom of Sea and Sky set
Of course, this also makes card printings of this Pokemon fetch a good price, and the Expedition set of the Pokemon TCG has one of the most expensive printings
Accessories: High-margin items (6570% gross margin) such as card sleeves, top-loaders, deck boxes, and binders make excellent impulse buys for collectors purchasing packs
Best three I would look after are: Antihuman Intelligence ME-PSY-YA (0,0 Pendulum Monster) is a reasonably good competitive cards