Although we all pay MSRP (or higher) if you are curious about the Mini invoice prices for a specific configuration you can find it on the costco auto site.

http://www.costcoauto.com

After putting in your zip code, click on "car research" on the left. Then search by vehicle make and model. Once you've picked the Mini you can add all the options and at the bottom it will list invoice and MSRP prices.

It also has some nice detailed technical specs too.

 

I used the MSN site and Consumer Reports. Offered $500 over invoice. They are very close to invoice.

 

Edmunds also lists invoice prices: http://www.edmunds.com/new/2006/mini/cooper/index.html

It's interesting to see how much (or actually in most cases how little) the dealer makes on each option.