Type in a google search HOn30
There is a fair amount out there
One place to start is
http://groups.yahoo.com/group/HOn30/
http://www.hon30.org/
Barry at  http://www.railrec.com/
makes some nice HOn30 kits
and I hope it's OK to post
http://www.bnfhoby.com/
Ask for Al.

Dave