I just finished reading Cloud Computing by Nayan B. Ruparelia. It had some good ideas I thought I would share.
There are different models of pricing.
There are 3 different Utility Models- Consumption based- Price Models, GB, MB, CPU cycles.
Transaction- based Price Model- data related for INaaS and BPaas abstraction levels and is equally suited to all cloud deployment models.
Subscription based price model- all you can eat model monthly