I recently purchased a 2011 sedan with the stock sport bumper. Where is everyone getting the OEM sport lip for their sedan? What is considered a very good price to pay for it painted and shipped?

 

All Oem spoilers are paint-matched from the factory. Here's a source and the prices are pretty standard, Sport models start halfway down the second page.
Discount Infiniti Parts | Genuine, OEM Infiniti Parts | Infiniti Accessories | Huge Instock Inventory

 

I've had good luck with Discount Infiniti Parts also. One thing they do is take your VIN and make sure the parts you order are correctly matched to your car. That's a nice touch as the part numbers and descriptions (especially for body parts like spoilers) are somewhat unclear on most of the sites. My parts actually shipped from Gwinnett Infiniti in Georgia.