Also try the Portland Sprinter Connection guys.
Earlier this year I bought four 16" alloys from them, and lucky me, one of their reps was planning on driving down to San Diego and delivered them. These match what I have.
I wanted to get rid of the one steel wheel I had as a spare, and an additional alloy for the second spare I always carry. Anyone in my area is welcome to the steel wheel. I will probably be keeping the other two alloys in case I ever need them because it took a good length of time to find these T1N alloys.
Send them an email or a call. They might have what you are looking for or can find it for you.
I had heard Europarts SD in the past had some new alloy ones for around $275 each.
The four I bought have some scratches and a little bubbling in places, but nothing that would compromise the integrity, and I am happy to have them.