A quick search on eBay for "Cajun accordion" revealed that Travis Matte is selling a fairly new C accordion built by Rusty Sanner, and a fella in Canada is selling an older Acadian in the key of D.
I tried to find the D the guy in Canada was selling and I'm afraid it's gone now. Joel had someone in Canada holding his for him and when we called to ask when we could get it, the person told us they'd "gotten rid of it." So we're kinda freaking out. It was a sunburst style made in 1966. I don't guess you managed to get any info on who was selling it?