since they're not being sold by verizon anymore, you have to find them on ebay or something: OEM Verizon Motorola Droid 2 A955 Snap-On Hard Case Red | eBay . brand new i paid 25 bucks!
i've had my case for one year and it just broke so i'm ordering another one. the plastic isn't the sturdiest, but it still provides decent protection. just account for buying one in 1 to 2 years if you keep your phone that long. there are much sturdier cases out there, but this one is a B- and good luck finding any other case that fits the car mount!