If not on eBay, where, then? The list of "sold" cards on eBay appear to me to be a pretty good starting point, but if there's something I don't know, like "eve

If not on eBay, where, then? The list of "sold" cards on eBay appear to me to be a pretty good starting point, but if there's something I don't know, like "everyone on eBay is a scalper" (which is not implausible) then where should I be looking?