Gotta go with Gacharic Spin. Michico Koga is the leader and might be the most skilled slap-style ebassist in the world. She's endorsed by Bass Magazine too.
US music pretty much sux theses days. Japan is where its at.
From Jaco: For practice, play a fretted bass, fingering ON the fret.
From me: Don't look at the neck. Trying to play in tune visually is impossible, it will only screw you up.