"long eddy" wrote:
How about spruce trees at a height of 6 to 8 feet - not 10 to 14 feet.

What would be the cost per tree?

Also, how many inches would they grow per year in Zone 5 with partial to
full sun?

Sun has little to do with it, that spruce trees need full sun goes
without saying... but they also need decent soil and moisture.

You seem to be in a big hurry, how old are you that you're racing old
father time? Trees take time to grow, they are not instant. And even
if you plant mature trees they will not grow at all the first 3-5
years as they will be in shock from being dug up, and some may not
make it. Were it me I'd plant young potted trees, and plant extra.

I have many thousands of Norway spruce on my property, all sizes as
hundreds are from reseeding over the years. I wouldn't attempt to
move any myself that are more than about 2' tall. You can figure that
Norway spruce will grow betwen 6" and 2' a year, weather plays a big
part. In forty years a 2' tree will reach between 50' and 70'.
Colorado spruce will grow about half as much. I think Norway spruce
make a better screen/windbreak, they do much better packed close
together than Colorado spruce. Norway spruce also hold up much better
to heavy snows... with Colorado spruce you'll have to be out there
many times during a heavy snow with a broom sweeping the branches or
they will break off.

An excellent source for trees and information near where you live:
http://www.storysnursery.com