The last time I looked up the dealer price of a Pruis battery pack it was near $4,000 at bit less than the ordinal price of $5,000. Batteries are the Achilles heel of ALL todays hybrids. At some point one will need to spend thousands to replace the battery pack. That does not bode well for resale value, at some point down the road as well for the buyer.
Personally I would not buy one of today's hybrids because the premium one needs to pay, to drive one home, will buy ALL of ones gasoline for a similar sized and equipped conventionally powered car for two or three years.