Yes, this is true, the OP was asking for the trial version.
However, while one can still purchase the product from many sources, in the
MS world it has all been replaced by the 2008 product as far as the trial
version goes.
I did find that they still have the virtual labs for the 2003 product
available.
http://techsoeasy.spaces.live.com/blog/cns!AB2725BC5698FCB8!157.entry
and I also found this:
http://www.sbstestdrive.com/
and this:
http://technet.microsoft.com/en-us/bb539981.aspx