Let see on that site to verify price brand new...
http://www.realoem.com/bmw/partgrp.do?model=BT33&mospid=47798

I have for sale:

2,5L engine, 6 cylinders with only 580 miles running, asking $3,500 USD.
Comes from a Z4 2003.

ALSO
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Almost a complete interior trim in a very good condition, comes from car with no more than 600 miles running. Color is black.

Front center console: $200 USD w/all little thing


Rear center console: $175 USD
w/ all little thing

Driver inside door trim (leather black): $250 USD
All little thing included like Handle pull etc...

Panel Assy, Upper & Lower Trim
(Behind the seats) Right and left side $150

Trim center console aluminum brushed: $75 USD

Dash Trim aluminum brushed (2 pieces):
Small piece (Headlight Switch Surrounding) SOLD
Still have one (the bigger one) $100 USD

Dash is sold

DASH Instruments:

Module pass. knee airbag (blk): $150 USD

Box glove and housing: $100 USD

Switch lighting: $70 USD

Control Temp. w/ATC: $85 USD

Radio AM/FM CD: $175 USD

Rear Speaker kit: 2 Mid-range, 2 Sub-Woofer: $175 USD
Front Speaker kit: Tweeter, mid-range, woofer: $125 USD
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Steering wheel chrome trim no airbag: $100 USD
Complete Steering Column w/upper & lower trim panel: $400 USD
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Black Soft Top (manual): $950 USD in good condition.
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Suspension items, ask for a specific piece, then I will make you a good price for. There are too many pieces to listed.
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Add shipping fees, let me know your zip code if you are interested about something listed.

All is negotiable, make a reasonable offer, i will consider it.