There is a "special edition" ASIN : B07G2PK4RH that seems cheaper than the older Kubelik DG boxes now (about 40 EUR)
Probably too much of a hazzle but I think all of the DG Kubelik except #3 and #7? was available separately in one or another cheapo DG series: Resonance/Musikfest, Galleria, eloquence, virtuoso..