Das Kombinat® released a 7" single 'Haushalt und Technik' on block 4 in 2001. It was limited to 500 copys and was soon out of print. Maybe you can still find a copy on some other shops/mailorders.On it are the new songs 'Waschmaschine' and 'Aseptisch'.
The last full CD release is 'Betriebssystem' from 1998 and its still available.
The first two official tape releases Existenz from 1990 and B.S.E. from 1991 are available as download at http://kombinat.bandcamp.com
Its up to you to decide what you pay for them.