Uh, the OEM one is like $40 or so. You can also use the solid E30 M3 one, Powerflex, or I personally went with the MZ3 bushing. It has two pieces of metal on both sides instead of one.
__________________ Present: `99 M coupe Past: `91 330is; `95 318ti Active; `93 325is; `97 318ti Sport; `89 332is