Be sure which web site you are on! As I posted about a month ago, the Sun site shows that the voucher costs $200 US. But, if you follow the link off of the Sun site to find a
testing location ... you get out to the Prometric site. One of the pages that you will see says that the test costs $300.
I guess you can buy it from Prometric for $300, OR buy it from Sun for $200 and schedule the test session through Prometric. I bought mine direct from the Sun site.