Hopefully you can find one. They are out there. I'm sure Ebay or somewhere like that. I'm quite certain that you won't find a new one. Good luck and keep us posted. If you find one and are uncertain about whether it will work with more than 4GB or any other question really, just post back here.
Edit: I was just on Fleabay and found both models that I own for sale. So if either of them interest you, they are very good motherboards. The P5W DH Deluxe is still running and has been for near 10 years. The other (P5Q Deluxe) ran for over 7 years continuously. In fact my systems are on 24/7, they never get shutdown. So if that isn't a testament to their longevity, I don't know what is. Furthermore, the CPU's in them were all overclocked. Though the P5W DH Deluxe that's in my wifes computer has the Q6600 at stock because she doesn't need the extra performance for FaceBook, Ebay, and general internet use.
So assuming you can get a seller that is reputable, I wholeheartedly recommend either motherboard.