There were 12 DVDs I think released without region coding, specifically in Australia. And their order was completely ransom and mixed both series.
There is not one which is a replica of the Flight to Cloud Castle however; in order to get the 5 episodes which were on this DVD you need to find 4 of the Australian ones.
1) Woe Is Me, Little Piece of Magic & Flight to Cloud Castle
2) Spike's Search, Somnambula & The Golden Horseshoes
3) The Ice Cream Wars, Mish Mash Melee & The Return of Tambelon
4) The Prince and the Ponies, Rescue from Midnight Castle & Escape from Catrina