You got it takes BIG BUCKS to have Pandas. We love our Pandas in D.C. They are a huge draw and since we finally had the baby Panda its been an even bigger draw. But when you consider the money to rent the Pandas and the required facility they would have to build, I just dont see it happening. Believe me if it was that easy many more Zoo's would have them.
And unfortunatley when or if they have a baby..(very complicated and rare to have a baby Panda).the baby still belongs to China.
It would be a wonderful addition to DAK but I think its wishful thinking.
Here is the link to "Our" Pandas. Including the cute new baby...well he (Tai Shan) is actually 1 now.
http://nationalzoo.si.edu/Animals/GiantPandas/