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