jmo,
the $200 he's offering are for rare ones he doesn't have. These would be those you never/very rarely see on e-bay. Some I have pictures of I've never seen offered anywhere, but I'm sure they exist. As for your other question the most common, spyder logo SE knife will run anywhere from $60-$80 depending how badly someone wants one. The flag, Pro Rodeo, HK, spyder PE are more like $70-$100. Then it's only up from there.
Chris,
Be Excellent to each other.