You could post on here ,on the for sale column , or ebay as you say , where you will get your biggest audience , or join facebook , and then search for" vintage signs and advertising collectables" which is where most collectors end up , or there are watsapp groups also . There is also a sister site to vintage signs , which does uk tobacco tins and signs . There's plenty of choice out there . There is also a facebook site called "advertising signs ,for sale and wanted .The world is your lobster , LOL