You are hoping to deal in a commodity with a small demand .. a niche market. Therefore you want the biggest exposure possible.
There is nowhere else like ebay. Why dont you give it a try.
My son makes a custom made item. He has never advertised it, but he has taken some photos and put them on Facebook on a closed forum about 3 years ago. He has very few customers in the UK, but the orders never cease from Japan, Australia , Eastern Europe, The Pacific Islands etc.
Therefore we know if you put a specialist item in front of the right group of people, it will sell.