How expensive are Forbidden Crown, F&V, and Dominus Spark, and how necessary are they for decks that can afford them? | tcgmode

If you follow my posts, you know I play on Dueling Nexus, so card availability is never an issue. There aren't any stores that sell Yu-Gi-Oh! cards in my country, or at least I haven't found any; I've only found stores that sell Pokémon and Magic cards, so I only play on simulators since I have n...