Hi, I found one on Ebay, but they are VERY rare. In my experience with the French and German pre-owned market, you may find more often the smaller boats SR-124/SG-124/SJ-110. I think an SG 140 in a good state is a bit of a strech, probably someone will outbid anyway. Maybe to look for a similar hypalon sib/14ft, less popular brand. Good luck!
