In this video, the guy makes a green juice with nothing more than a blender and a paint strainer.
So now you have no excuse as long as you have a blender. I am not sure if this type of use would reduce the lifespan of your blender though. You might also want to use something like muslin gauze (or something that is specifically for straining foods) instead of a paint strainer, just in case there is anything toxic in the strainer. Check out the health benefits of juicing.