If you are looking for how much it costs to operate in the Windows Azure Cloud, Microsoft has published some pricing information to make a rough estimate of how much it will cost to run in the Windows Azure Cloud.
You can use this general purpose Pricing Calculator to determine estimated costs for using a variety of services in the Windows Azure Cloud: https://azure.microsoft.com/en-us/pricing/calculator/?scenario=web
If you are specifically focuses on running virtual machines in the Windows Azure Cloud, you can get pricing for that here: https://azure.microsoft.com/en-us/pricing/details/virtual-machines/
Of course, some of these overall costs may be reduced for running in the Windows Azure Cloud if you currently own an MSDN subscription. Depending on what type of MSDN Subscription you have, you may be able to use anywhere between $50 and $150 per month towards your Windows Azure hosting. You can read more about the Windows Azure benefits for MSDN Subscribers here: http://azure.microsoft.com/en-us/pricing/member-offers/msdn-benefits-details/
If you need to activate your MSDN Azure Benefits, you can do so directly from here: http://azure.microsoft.com/en-us/pricing/member-offers/msdn-benefits/?WT.mc_id=MSDN_Subs_Portal1
You can use this general purpose Pricing Calculator to determine estimated costs for using a variety of services in the Windows Azure Cloud: https://azure.microsoft.com/en-us/pricing/calculator/?scenario=web
If you are specifically focuses on running virtual machines in the Windows Azure Cloud, you can get pricing for that here: https://azure.microsoft.com/en-us/pricing/details/virtual-machines/
Of course, some of these overall costs may be reduced for running in the Windows Azure Cloud if you currently own an MSDN subscription. Depending on what type of MSDN Subscription you have, you may be able to use anywhere between $50 and $150 per month towards your Windows Azure hosting. You can read more about the Windows Azure benefits for MSDN Subscribers here: http://azure.microsoft.com/en-us/pricing/member-offers/msdn-benefits-details/
If you need to activate your MSDN Azure Benefits, you can do so directly from here: http://azure.microsoft.com/en-us/pricing/member-offers/msdn-benefits/?WT.mc_id=MSDN_Subs_Portal1