Depending on what you're willing to pay, there are few on simpsonltd.com You can filter the inventory to work through their large collection. Kind of a cool site with lots of militaria.
You might receive some replies to a WTB posting on 1911addicts.com, but you must have been an active member (at least 20 'meaningful' posts) for 2 weeks before you are granted access to the classified section and PM function.
Edit 3/24/2024 - Addicts now requires at least 30 days of membership & 50 posts before being granted access to the classifieds & PM function.