Using the Arbor Day website's "Tree Wizard", you enter your zipcode, then you enter information about the tree that you are looking for.  Once you have completed the short and quick questions, a list of trees will appear that meet your selections. The website will also give you an option to shop for each plant, and an option to view more about this plant. 

Link: https://www.arborday.org/shopping/trees/treewizard/intro.cfm

Using the National Wildlife Fund's Native Plant Finder, you can find all sorts of Native Plants and Butterflies that live near you. First you must enter your zip code, and then you can peek around. This website also gives you an option to look for Native Trees as well.

Link: Home - Native Plants Finder (nwf.org)