About 6 months ago, Silver Star Recycling in Rancho Cordova, CA (Sacramento area) happened to have a 300CE Coupe Black/Black apparently with Sportline. The 2-front and 2-rear seats were sold by the time I had a chance to trek to Silver Star (2 hours away from SF) for $2000.00
Nonetheless, I was lucky to find exactly what I needed from the coupe: the sliding burl walnut top rear passenger console box (underneath rear arm rest). The wood (2 pieces: panel and sliding wood top) were mint condition and I used it to replace the ones cracked in my E320 Coupe.
You may wish to visit/ monitor their website.
The last time I viewed (couple of weeks ago), the website listed 500e, e500, and another black 300CE rebuildable in W124 inventory.