Here's what you've asked for:
$500 for the tour (
http://tour1.nakedcollegegirls.tv)
$500 for the banners (really fucking overpriced, but oh well)
$350 for the galleries.
That equals $1,350 using basic math skills.
I've paid you:
$500 at the beginning of the project and you've been paid $582.36 so far in checks since. That leaves $267.64.
How do you come up with being owed $500.00 ?