> I'll take a look at the OSS stuff you linked: thank you!

Hope it fares out! I didn't message on your behalf because I didn't know if you had agreements already with them. But $20 or $70/mo saved on outgoings for a few emails certainly worth a shot :)

> The pre-allocation means some kind of commitment: every time I've looked I've baulked at dropping many thousands of dollars in one go (and it screws up my terrible book-keeping :D ). I should probably revisit it. It's really nice to know I'm not paying for things I don't "need", but it's unlikely CE usage will drop _that much_ in the next year or two (say).

There's quite a few ways to do this, and if you do manage to get some info from AWS they'd almost certainly be happy to help you out. Sticking with AWS, you're already using Spot Instances but you mentioned you have:

    GPU Production: 2-4x g4dn.xlarge/g4dn.2xlarge with 1 on-demand base + spot instances

Assuming you've got 1 g4dn.xlarge running for 730 hours, that's ~$380. If you purchased a RI with no upfront for that machine, you'd save $140/mo, the only thing you're comitting to is running that instance 24/7/365 for a year (not paying the full annual cost up front) . You could almost certainly do the same for some of the extra cheap instances (and move them all to g style) for another $20/mo, but it's really picking at hairs there

Well; I emailed the address at the AWS link and got: "The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly." :)