i can tell you this, one of my homies offered E-40 5,000 for 16 and 40 said yes, so we told him we'll give him 7,000 for 32 bars and he said no... and this homie of mine is a well known rapper who 40 knows well. so i can guarantee its gonna be 5,000. if you got the bread, holla at me and i'll put you in touch with 40.
but, if you were smart and had that kinda loot to spend you'd be better off gettin hella verses from others. you can almost get a whole record from most of your favorite bay area rappers for 5 grand. or you can get tons of dope features. i can make that happen too. holla