SPACE MARINE wrote:How much should I be willing to pay for a small lot of black knights (blue dragon crests) on Ebay and such sites?
Your best bet is to just look around on bricklink to get an idea of what figs are worth. Just a ball-park figure, but common figs like Black Falcons or Lion Knights go for around $3 - $4 each on bricklink.
As far as ebay goes, I would recommend just watching prices there for a month or two on the bulk lots of figs. It takes some patience, but if you just watch a few auctions, you'll get an idea for what things are going for. Keep in mind prices on ebay are somewhat inflated right now because of Christmas coming up. If you really want to pick up some vintage stuff, and are willing to wait, your best bet is to hold off until February or March when things have settled back down.