A radio telescope optimized for the task could do even better, and researchers are presently developing plans for just such an instrument. What's more, it should cost about $20 million. In terms of space telescopes, that's dirt-cheap. With it, they think they will be able to map as much as half of the observable universe faster and more cheaply than galaxy surveys can.
Now all we need is a vehicle that allows us to put these intergalactic maps to good use.