Here on L-Rides (lego amusement website) they make a roller coaster, does anyone know where I can get the set he uses for the tracks?? You will need to scroll down on the rides section to Roller Coaster http://l-rides.com/

If you are searching for the set in the title: Only onethousand of them were made. But I don't know if there will be something new. When you search for this set-number, you'll directly find their shop-website.

http://www.therollercoasterfactory.com/products/roller-coaster-factory

I bought a set a few months ago, but now it says "sold out."

I would love to see more carnival themed sets in the future. I have yet to get my hands on one.