I build them on AWS now, mainly since it takes me 5hrs to download the source compared to a few minutes on AWS. Anybody who knows of a better cloud building service? I consistently fail to estimate instance costs.

You are using a spot instance right?

I am, and it doesn't cost much at all just sometimes there's problems with builds you have to manually track down I'd rather pay a flat monthly fee somewhere and get x amount of builds/bandwidth if possible. Build time is around 14mins only + the few minutes to repo source + few seconds to run my script that yoinks the junk from Android and the kernel.

I'm certain you can use travis-ci for that purpose.

care to share that script?