Go to the WI DNR Nursery web site and order trees from them for delivery in Spring. Their prices are very reasonable (.50 per tree). I ordered 500 shrubs last year and just ordered the "Deer" wildlife pack for this coming year. This pack of 300 trees includes 100 white spruce which I'm planting for deer bedding areas. Spruce retain their lower limbs so the cover they provide will last a lifetime.
We planted red pine 15 years ago and they are so tall now the lower branches provide no cover at all.
The wildlife pack also comes with 100 Hazelnut and 100 White Oak. All for about 55 cents per tree.
Here's the DNR Nursery website.
http://dnr.wi.gov/forestry/Nursery/
Their minimum order is 500 trees or 1 wildlife packet which contains 300 trees/shrubs.