I'm going to recommend probably the cheapest alternative that is completely beyond anyone's radar here. I use one for a bit of low end beef and additional gain, but you can dial the gain back as well...
The Ibanzez BB9 Bottom Booster.
That's right, I just recommended an Ibanez pedal.
It's actually a great sounding pedal that really does add a nice bit of round oomph, and has a very musical gain stage to it. I've only found one pedal that is as musically comparable to its tone IMO, and that is the MojoHand DMBL. That one retails at $180, whereas you can get the BB9 for $50. I highly recommend giving it a spin if you can.