Jasonrocha, if you are looking to pick up a DC9310 charger it's going to be $90 dollars even at Dewalt Service net. Here is a link to the product.
http://www.ereplacementparts.com/search_result.php?q=DC9310&type=search-part&alert=1However, you likely willing be either or shipping/tax, so there is a chance this item could end up costing $95-100 dollars. Considering the battery that came with your DCD950 is $102.89 dollars
http://www.ereplacementparts.com/dewalt-dcd950-type-18v-xrp-hammer-drill-parts-c-1009_9661_16250.html but that is before tax and or shipping.
I can only imagine the Lithium ion version is even more expensive, likely exceeding that number. Not sure how much you paid for this drill, but needless to say, this could cost over (potentially) $300, maybe even more.
Buying a used battery isn't the best route either, because unless you personally know the person your buying from your going to be taking a gamble. The battery may work one day and the next, it might not. Or if your lucky, it will work for years on end without a single issue. The odds are between 1% and 100% depending on the situation. Even a 50% gamble is considered good with batteries, but unless you have the tools to measure all the aspects of the battery, your only other option is to take to a battery shop such as Batteries Plus.
Even then though, it's still a bit of a gamble though, as if the batteries are on their way out, either you replace the cells or replace the entire battery. Buying the cells is fairly simple (to a certain degree) but actually installing these cells correctly (correctly in this case, ensuring that all the connections are solid so they won't burn out. This has happened to me before.)
However, if you do decide to replace the cells, your are likely going to need a Torx T 10 screwdriver/wrench/drill bit to open the batteries up. In some cases, it might be Torx T 15.
