bonsaiwood
Shohin
You probably won't miss out on anything because there will always be a market for good trees and hobbyists who want to buy them. For what it may be worth to you, nothing beats seeing a tree up close to get the full picture of a tree's suitability for bonsai. There are many experienced bonsai practitioners who feel confident enough buying a tree sight unseen. On the flipside there are plenty of bonsai beginner's who pull the trigger with a ''buy it now and figure it out later'' approach. From someone who has gone about it this way more than once, it usually doesn't work out well. Every tree I have ever bought on a whim (with the exceptio of one I'm experimenting with) has moved out of my garden. just my 2c.