Dieter; we are not a plant shopping site here at ATP but maybe one of our growers will see your request. Price will of course depend a lot on where you live.
Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
I am thinking that a 12 foot high tree would most likely have to come from a source local to the purchaser; purchased through the mail the tree would be closer to 12 inches high.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"