i already know of a few cloud providers and already use AWS. i am looking to expand my cloud usage. i am only interested in those that offer IaaS (infrastructure as a service) on a time-used basis. although i intend to also use other services they might have, time-used IaaS is the critical requirement. i have tried to sign up at a few others but discovered their IaaS offering is not time-used. it's more like VPS, where you rent a whole server for a whole month or as many as you want. and i am not interested in Azure or Google. any suggestions out there? being able to run the cloud version of Ubuntu there is a big plus (as i do at AWS).