Another place where I always find fellow Gothlings is at antique markets. I personally have a thing for all things old that belong to another era, another century. The class and the elegance of those past year is unbeatable. Those unique objects, so passionately createad and handmade are a true treasure for me. You do not find such beautiful things in today shops. It's very rare, especially now that minimalism is the main trend. The less decor the best it is. I don't know you but I find this theory very sad as it bans creativity a lot.
But back to the topic, antique markets are a unique occasion to find gothy things! Cameos, old brooches, lace gloves, old tea sets, bird cages, gramophones, old records, vynils, ancient perfume bottles etc. Also some steampunk stuff like stargazers, monocles, one of a kind pocket watches!
You can basically find anything. Some times even good pieces of clothing!
But beware because many times what you see is not really old. They just make it look so!