I ordered white housing on parts4repair.com (somewhere in China I think) for $56.50 USD. I took 9 days until it it arrived via DHL (quite fair for me). Shipping cost $40.33 USD (to Germany)
But all in all its fine for me and this was the object of desire since I slightly chipped it on the corner when my white beauty fell down on the asphalt.
Now I'm looking to repair the current case (file the corner round round and polish it afterwards) and keep the new one as a backup.