hi living in the uk we seem to have run out of DC superman have others come across this problem????

No, atleast not where I live. Around here they are moving at a snail's pace..no one seems to want them.

People around here and buying as much as they can so they can prepare for DC modern. The only stuff we're really running out of is Marvel Origins.

no more stock in holland (the netherlands) as i've been told by the eindhoven store

Yes same thing here, Marvel Origins is running out. They have went out of print, I still don't understand why UDE has stopped production of them.

People aren't going to buy them forever, they'd lose too much money if they always printed them.

Finite amount of printing time, usually the presses of large companies are reserved months to years ahead of time. Don't forget, UDE prints lots of sports cards, YGO cards, Shaman King cards, etc, etc.