I don't think you need one on Sprint. At least it did not say so in the order page.
Speaking of order page,
Amazon also has it now, but it states ships in 3 to 6 weeks.

But if you can wait that long then maybe it may be cheaper if you consider shipping chargers.
As for the listing of 2.0 on the Sprint site, I know, I noticed that as well. but the picture looks the same as the Lapdock 100. But that doesn't mean anything.
If you are a Premier customer you can use your Premier discount (which end in Dec) to order the lapdock. That's a 25% discount, which translates to
$125.00 $187.50 instead of $250.00. But the catch is you have to do it at a Sprint store.
I went to the Westbury NY store here today before I found out this bit of news and they had no idea what the lapdock was. Did anyone even go to the training?
Therefore I am going to the Sprint Corp store in Flushing NY with a print out of the lapdock off their website and order it with the discount.
Lets see if all goes well and I hope I'll get it before my trip Friday.
If not, the Bionic lapdock will do until I get back.
TS out