WorkTogether - 12:36 pm on Jun 18, 2012 (gmt 0)
Yeah I would try ebay for sure. but if other sites are already selling 'x' product there is probably a demand for it already.
have a look at Googles keyword tool. it's not perfect but will give you an idea if it's searched for.
But if it's easy to build a site why not do it anyway. Not sure how much you need to sell but some sales are better than none.