There's no single price for a Game Boy Advance SP. Value swings wildly based on condition, model variant, completeness, and where you're buying. A scratched, loose console might fetch $35; a sealed Pikachu Edition SP can exceed $500. Here's how to navigate the market.
A complete-in-box (CIB) unit with charger, manual, inserts, and original packaging sells for 1.5-3x a loose console. Original Nintendo charger alone adds $10-15. Games included (especially Pokémon, Zelda, Metroid) add $15-50 each.
Buy the best condition AGS-101 your budget allows. The backlit screen transforms the experience, and resale value holds stronger.