If you wait and are patient these pop up for under $600 on the classified in this forum and others fairly frequently. Due to the stainless being discontinued, some folks think their used ones are more valuable. A used blue usp40c can be found for $500 - $550 if you look around. The only thing I don't like about the local deal you are looking at, is the lack of a warantee card. I know H&K's service is the subject of hot debate, but I like the peace of mind a warantee gives me.
Good luck, It's a great pistol!
--usp_fan