What I are referring to as "Geek" magic?
I'll assume you are referring to side-show stunts for which there are some specialty books if you look into that niche; one of the classics is
Swami Mantra which has some excellent material on most of the classics and then some. Here's an interesting web site that offers an insight to such work
http://www.goodmagic.com/websales/brill_sideshowstunts/index.htm you may likewise look up material from Todd Robbins who worked the Jersey Boardwalk for years and side by side with one of the Midway legends, Bobby Reynolds. Another guy that might be able to steer you in the right direction would be Canadian mage of mayhem Scott McClellan. He's a third or fourth generation carney and one heck of a great guy that runs his own series of touring side-shows.
On The Other Hand. . . if you are referring to Bizarre Magick, which is a bit different from the Geek & Freak avenue, I'd strongly encourage you to start with the
Arcana of Bizarre Magick by Jim Magus {
http://www.lulu.com/product/paperback/arcana-of-bizarre-magick/4379157}, aside from some wonderful routines the book is filled with the factual history of Bizarre Magick and discussion about it's various styles and divisions INCLUDING the side show element. You may likewise enjoy the Larry Baukin Anthology {
http://mevproshop.com/baukin-anthology.html} which is simply brilliant when it comes to routines, themes and concepts.
In prelude to these things you may wish to look over my FREE PDF on Bizarre Magick {
http://www.lulu.com/product/ebook/about-bizarre-magick/17796655?productTrackingContext=author_spotlight_767346_} where you will find other source materials listed. Last but not least, spend a few days looking over this site --
http://www.dragonskull.co.uk/main_map.htm where you will get a great education and more links to resources.
Hope that helps.
