Welcome to the forum. There are the figures from the 2002-2003 and then the new ones from 2008 to now.
I great place to get good prices on 2002 & 03 figures is the hive of villainy:
I've gotten some great stuff from him at a good price.
Right at this moment eBay prices are down on the 2008 and on figures. Some are still high, but way less then they were.
I personally have some for sale in my eBay store (link in my sig)
Again, welcome and have fun here.