Newbie question, Brian:
The nursery you quoted has this olive for sale:
http://cgi.ebay.com/Shohin-European-Olive-Skylark-Dwarf-Bonsai-Tree-/120673645886?pt=LH_DefaultDomain_0&hash=item1c18b5b53e
The trunk size is quoted as 1". I've always assumed this meant the diameter of the trunk...