These kinda contests are honest...
Yes, it is open to aquiring a tree from anywhere...
Yes, people can spend what ever amount of $$$ on the tree... so, right off the bat most think the more money spent the better, and I am sure some will vote on and will be swayed by bling...
But, really in a case such as a styling competition, at the end of the day... the determining factor of who wins or not should be always judged on the before and after picture, and the transformation that the artist achieved, and their work.
So, my own personal suggestion is to find material regardless of if it cost a dollar or a hundred dollars, that best allows you to show off your talents and your skills... to be able to bring a piece of stock to as close to a show ready looking tree as possible.
Pay attention to how your wire looks, your padding, any cuts or chops... and try and be as professional as possible! If you are able to pick material that allows you to throw it in a nice pot now, rather than a plastic nursery container... the better. I avoid material that is too safe... Seeing there is hardly any transformation and we see none of your skill. Yet, it is a today thing... so I also avoid any material that is going to take years to develop, or to big of a tree that takes years to fill in negative spacing.
Think shohin size, with lots and lots of branching... this you can find at both a big box store and a bonsai nursery, and without having to always pay a lot.
Good Luck to everyone who enters!!!