The Upton recommendation is reckless, as usual. Upton does decent work but you a are putting a couple grand into aspects that are not the quality of the bass. If you are already in IL, you will get far, far better deals in the Midwest than on the East Coast. Chicago has some great shops, KC/St. Louis Strings are serious shops, Etc. There are also good shops in Ohio, Texas, etc.
If all you need is D, then just a get a Spiro low E and tune to D when you need it. It is two twists and it is easy enough to tune up and back.
If all you need is D, then just a get a Spiro low E and tune to D when you need it. It is two twists and it is easy enough to tune up and back.