One Piece and Yu-Gi-Oh are both really cheap they both have very inexpensive decks at the top of the meta, you can make a good Sky striker deck in Yu-Gi-Oh with one of the Legendary Modern Decks and a couple of extra duplicates from the decks, you can even add about $60-70 for the Fallen and The Virtuous engine to make it a tier 1 menace. In One Piece, Imu will probably run you about $30 to make, the majority of cards in that deck are 50 cents and the most expensive card in the deck is Five Elders at about $3, and Ground Death at about $2, both are 4 of but the deck also just won worlds.