So, the 150TB is what feeds the CDN? How big is the data you're serving? There is some gaming you could do here stitching together instances on other clouds p

So, the 150TB is what feeds the CDN? How big is the data you're serving? There is some gaming you could do here stitching together instances on other clouds possibly (digital ocean gives you 1TB transfer on a $5/month instance), but it's less than ideal and you're effectively going to be building a file hosting platform. A quarter rack somewhere with a few servers might be the cheapest route, but now you have hardware to deal with. I've been doing some consulting the last few months while I'm between jobs - if you're interested in having some help with this, it's an interesting problem to me.