I've become something of an Ebay bounty hunter over the years, picking out the bootlegs and putting them to their doom. Very informative and helpful~
Also, those figures. They are glorious.
My strategy is to check the photos--do they look home-taken? Is the product shown in a family room, bedroom, kitchen, etc.? CHances are if both of these requirements are met, you can expect a legit item .Of course this isn't always true, but the odds are much higher.