Is there any place to look for a bigger gas tank that can easily be swapped with the little stock tank?  I have a 2001 savage and would like to not have to stop at the gas station every other day to put in $4 in gas.

I think I heard a Vulcan 750 tank is about the easiest, but still requires modification.  

If you find something that works, please let us know!  

That tank aint to pretty, but I'm sure it gets the job done.  I think it is actually more work than fabbing up a few brackets to mount a different tank to your bike.  It's  a neat idea to keep the stock speedo and key gas cap with a bigger tank. You could probably do something similar and chop out the middle section of the stock tank while building a custom tank around it.  The biggest thing that is chopping out all your room for gas is the spedo in the middle.. if you want to eliminate the speedo from the tank patching across the speedo hole would allow probably a few more quarts of gas with a very close to stock look.