The finish is called Almost black or Sheer black - See through black
I think solid black might be less expensive (and I'm pretty sure the basses Jason used onstage were solid black)
Jasons basses also had the back of the neck/headstock clear coated (like my custom Elan) I think the current price of the sheer black finish with clear neck is about $1500
Quote generator should look something like this:
NECK FEATURES
4 string 6400.00
Right-handed 0.00
Long scale 34 inches 0.00
Maple neck w/walnut pinstripes 0.00
Ebony fingerboard 0.00
Fretted 0.00
Comfort fingerboard taper (wide bridge) 0.00
Mother of pearl ovals 200.00
No front LEDs 0.00
Aluminum side dots 0.00
Europa inline peghead 0.00
No peghead bevel 0.00
BODY FEATURES
Flame maple top 0.00
Bookmatched top 0.00
Maple body 0.00
No back laminate 0.00
Transparent gloss color finish 500.00
Europa body shape 400.00
Tummy and elbow contour 200.00
HARDWARE FEATURES
Bronze logo and script 0.00
Bridge block 0.00
Bird tailpiece 200.00
Brass truss rod cover 0.00
Plastic backplate(s) 0.00
Polished brass hardware 0.00
Gold Alembic Gotoh machine heads 0.00
Gold strap locks 0.00
ELECTRONICS FEATURES
Essence electronics 0.00
Total Price
Essence Quotation 7900.00
+ some for the finish, minus
monthly special and maybe some dealer discount.