Eh, i think you misread the post, the guy wants $500 for the Flagg (missing a few small parts. That more than likely will cost $200 to replace)
and he wants $100 for the Terrordrome "is missing a few parts and a few of the tabs on the bottom doors have broke, but they stay in place. The lever that opens the top door for the jet to come out is also broke"
The Terrordrome sounds either right at cost or a little high and depending on what the Flagg is missing it's either close to fair value or overpriced. Not really worth snapping up on the quick
EDIT: I've moved this thread to the ebay forums since you're not actually selling the items in question