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Sassafras Trees can be grown in zones 4-9.
Here is an article with more information about this tree.

You may be able to locate a tree in a local greenhouse or garden center.
Many times they can special order a specimen for you.

You can also Google sources for this tree and you should be able to purchase a bare root tree to have shipped to you.

https://www.gardeningknowhow.com/ornamental/trees/sassafras/what-is-a-sassafras-tree.htm

The roots will need to be planted, no roots should remain above ground.

Here are some links with more information.

https://forestry.ohiodnr.gov/portals/forestry/pdfs/factsheets/treeplantingguide.pdf
https://www.gardeningknowhow.com/ornamental/trees/sassafras/what-is-a-sassafras-tree.htm

Pruning is rarely needed in a Sassafras Tree, but in the case of winter die back , these branches can be removed. These trees are vulnerable to wind and ice damage as the wood is brittle.

https://www.gardeningknowhow.com/ornamental/trees/sassafras/what-is-a-sassafras-tree.htm

This article from a reputable website will explain all that you need to know about harvest and preparation: http://www.stonecirclefarm.com/articles/sassafras.html

First, do a soil test. If there are deficiencies, correct them. Unlike annual flowers, no fertilizer is recommended for trees if your soil is adequate. They need time to grow strong wood and stay healthy. An inch or two of compost or shredded leaves under the drip line is all that is needed. Keep up with watering as this plant does best in moist to wet soils.

I researched several reputable sources such as University extension websites and none of them mentioned that about transplanting sassafras.

https://www.uky.edu/hort/Sassafras

https://plants.usda.gov/plantguide/pdf/cs_saal5.pdf

https://www.gardeningknowhow.com/ornamental/trees/sassafras/what-is-a-sassafras-tree.htm