I've had a recent fascination with them, and I wanted to see what the market is like.

Replicas, originals, build-ups, whatever you got, throw it at me.

-Mike

Those are few and far between and a rich mans hobby to own privately.
http://www.motorcyclemuseum.org/classics/bike.asp?id=17
http://blog.hemmings.com/index.php/2006/11/28/1919-excelsior-boardtrack-racer-recreated/

Here's a nice Merkel for sale,only $90,000 :wonderlan

http://classiccars.ws/sales/1911flymerkboard/index.html

How about an almost complete restorable Indian,only $47,500

http://classiccars.ws/sales/1915indianboard/index.html