Does this mean that if I have a balance that exceeds the monthly cost, say $40 and I bring up a VM the cost of the time used will come out of the $40 rather than have my credit card billed for that one?
rsk wrote:
/me builds a t(r)oll-free bridge next to vonskippy's.
Also, yes. You pay for the (virtual) machine. Is it running or not, doesn't matter. On the other hand, if you need one only for a few days a month, consider creating it only then and deleting afterwards. You are charged for a month up front, but if you cancel a node before that month passes, remaining time ends up as account credit, and is used to pay your next bill (or part of it).
Creating and deleting a node, (and, probably, copying a disk image from another one, if you don't want to rebuild the OS each time) surely can be automated via Linode API.