A somewhat vague request. Formal uprights are not as common as other styles, but most big nurseries should have some if you're looking (& have some cash

).
What part of Florida are you in? Robert Pinder at Dragontree Bonsai has a lot of stock to choose from. I was there last weekend, and very mipressed with the quantity and selection. I'm sure he could walk you around and pick out some formal upright candidates.
http://www.dragontreebonsai.com/DTBHome_Page.html
Jim Smith at Durastone also has tons of stuff.
http://www.jimsmithbonsai.com/Catalog/catalog_page_1.htm
Don't let either web-site fool you. They both have rows and rows of pre-bonsai, as well as plenty of more developed, potted "real" bonsai trees.
Wigert's is probably a good bet too, though I've never been there.