EBay has it...from time to time
I was lucky to have bought a VHS copy of this excellent film a few years
ago,
someone advertised a VHS copy for around $10 and I bought it.
I watched tonight and, wow, it is great entertainment!!
I strongly recommend to look the EBay offers and I am sure it is advertised
there from time to time. They may even offer a DVD now!
Otherwise, there seems no official DVD will be available in the market
anytime soon.