You might prefer to use ShopForCloud.com to get cost estimates rather than use Excel spreadsheets. They have a lot prices to update, for example, EC2 has 7 clouds x 13 types of instances x at least 3 OS choices (Linux, Windows, Windows with SQL Server) x at least 4 purchase options (on-demand, light/medium/heavy-utilization reserved) => 1,092 individual prices! Just goes to show that they have pretty complicated pricing schemes.
You might prefer to use ShopForCloud.com to get cost estimates rather than use Excel spreadsheets. They have a lot prices to update, for example, EC2 has 7 clouds x 13 types of instances x at least 3 OS choices (Linux, Windows, Windows with SQL Server) x at least 4 purchase options (on-demand, light/medium/heavy-utilization reserved) => 1,092 individual prices! Just goes to show that they have pretty complicated pricing schemes.