I have bought several from rubbertrax.com. They are located in conyers,ga. I usually put them on machines I am reselling so can't say how good they are. But I think they are going to be the cheapest. I think they are going to run about about 1100-1200 per side on a tl140. They are good place to buy undercarriage parts from as well. Sprockets usually cost me around $250 per.