Originally Posted by friskinator
Buying four + one is likely your best bet. Musician's Friend and GC have the cheapest sets of four I've found, and there are some Ebay stores that sell individually for around $25.
I did this and got the extra one from Best Bass Gear because I had a $10 coupon. Only problem was that the finish on the MF set was satin and the BBG tuner was shiny. Not a big deal to me, but if it's a concern for you, make sure to ask about the finish before buying.