Every store is a bit different, but generally sports cards are located somewhere near the front of the store, often in an aisle of their own off to one side of the checkout lines
For sets where booster packs are available separately and as singles, youre likely far better off buying just the booster packs that you need, rather than a mini tin.
Take what you know about Cube, give it a theme and keep the cards
The defending player can then choose whether to play a Counter card from their hand, trashing a character card in order to add the specified Counter value to the defending card's power or an event card to activate the effect as explained on the card
have expensive cards worth lots of money, and these MTG cards still achieve double-digit prices in paper, there are versions available for much less than the gilded and etched foils for players with lower budgetary restrictions