A backhoe attachment for a tractor is a wise investment. However, it's not always the cheapest. If you decide to get a new backhoe attachment, its price will depend on the style, material, manufacturer, and overall capacity. For instance, backhoe buckets that measure out in 8" will usually cost around $1,500-$2,000. But, as the size of the backhoes buckets increases, so will the price.