* Make sure you specify that your Elastic Block Storage volume NOT be destroyed when the instance is terminated (or your data will be absolutely sure lost when the instance is terminated, which may happen without your consent if you get everything you need off of it before you terminate are using a spot instance and the instancevariable price exceeds your maximum bid).

* Pricing information may be found [https://aws.amazon.com/ec2/pricing/ here]. "Spot instances" are generally the way to go but be sure to bid with a high enough margin from the current price that you wont be shut down unintentionally. Even double the current spot price is usually lower than the on-demand price.