If you got season 1 by Millennium entertainment then you do not need to buy the complete series to get the extras. All the extras from the Commemorative Edition set are included in that season 1 DVD set.

I got the complete series by Mill Creek but it lacked the extras so I bought season 1 and 2 by Millennium to get the extras. I compared those extras to the ones in the complete series and it is the same exact stuff.

It does not even matter that the Commemorative edition is out of print.