>>50234361If it's mainly for playing (not collecting), buying MP condition copies off of tcgplayer is a good option.
Another thing to look into are the World Championship Decks:
https://bulbapedia.bulbagarden.net/wiki/World_Championships_Deck_(TCG)TPCI took some winning decks and reprinted them with different card backs, and silver borders + printed signature on the front. Usually you can get cards from these for fairly cheap, although some cards (Rayquaza ex, Jolteon star etc.) are still a bit expensive.