is the best place to purchase these figures, and for a reasonable price. The orange line Sandtrooper is currently available for a bargain £20. If you were looking for a genuine Darth Maul, then Niche gift shop on eBay had them cheap but not sure of the price now. If you don't mind damaged boxes then I think it was cheap.
There are a few fakes out there, mainly Darth Maul and Boba Fett. If it's cheap and from China or Taiwan it's fake.
There is also a black series collectors group on Facebook which is a great source of information and where you can pick up the older to figures for a reasonable price from fellow members.