One of the cheapest ways into a real basketball club in Barcelona: €200 covers the full September-to-June season with two trainings a week — around €20 a month — and you can spread it over three payments or apply for an Ajuntament IBE grant on top.
A friendly neighborhood basketball club in Poble Sec, CB Sant Antoni runs an escoleta (its "little school") for the youngest players before they move up into federated teams. Sign-up for the 2026-27 season is already open online.