Source of photos for backdrops

I'm just starting my second layout and am looking for a source of photos that can be used for backdrops. Looking for mountain, sky, logging, farming, small town, light industry. any suggestions?

Rich

 

http://www.railserve.com/Models/Manufacturers/Scenery_Backdrops/

 

This outfit offers a nice selection. I deal quite often with Scenic Express and always find their service commentable.

http://www.sceneryexpress.com/products.asp?dept=1100

NYW&B

 

I've used ones from Backdrop Warehouse and like them

System won't let me post a link

An example

http://www.flickr.com/photos/52481330@N05/5330225003/in/photostream

 

If you know anyone in the graphic design field, you might ask if they have a subscription to an image service such as Thinkstock.com. They have some horizontal proportioned landscape photos that can be enlarged on a wide format printer that are astounding in their ability to impart realism to your layout. I know not many people have access to wide-format printers, but Kinko's and similar does.