I purchased trees from two local state nurseries and the results were mixed. In one case the trees arrived in January, while I would have preferred a few months earlier at the beginning of winter. Also they often had few lateral roots which meant it took them longer to get going. What I do now is in the fall I collect the nuts from local trees which I wish to propagate (them being local ensures they are well adapted to my situation), bury them in a good location (well drained, irrigated etc.) and a year later in October/November I plant them out. I wait for when the ground is moist so I can save as many root hairs as possible when I carefully dig them out. Also, I have concluded, you do not do the seedling/sapling any favors if you follow the maxim of a $10 hole for a $1 tree. If there are established trees nearby (and in your case there likely will be), their roots will outcompete your new trees' roots for the nourishment you provided. Which means they will be worse off than if you had snuck them in under the radar.