Amazon just announced its AWS Marketplace and Moodle has a place at the table (actually 4 places).
You can now get Moodle from three different vendors all suited to run Moodle in the cloud and have the choice of 32 or 64 bit. Moodle 2.2+ anyone?
I am currently running Moodle 2.2 for a test site through BitNami Cloud and am quite happy with the results (and responsiveness). The solutions are totally scalable, the smallest installation costing around $30 per month to run. Increasing computer power (ram/HD storage) will increase the monthly fees and baseline. Pay for what you use. If the site is for testing and playing only you can easily “turn off” the servers to conserve resources ($).
Find out more at https://aws.amazon.com/marketplace