There isn't much you can buy for less than one cent these days, but you can store a whole lot of files in the "cloud" for $US0.005 a month with Backblaze's new B2 storage service. It will even give you 10GB for free. Backblaze B2 is similar to Amazon S3 (which starts at $US0.022 a month) or Amazon Glacier (which costs $US0.01 per GB). It's pay-for-what-you-use online storage — petabytes of space, even — that you can use as a backup solution (like you can with Glacier) or to host files on the web. B2 seems to be built with developers in mind, in fact, since there's an API for it and you can upload or download data using the command line (CLI).
Like Amazon S3, Microsoft Azure, and Google Cloud, you pay for both storage and retrieval (downloads). Downloads cost $US0.05 per GB, so this isn't really a Dropbox replacement or for frequently accessing files. But you could store 100GB of photos or videos there for safekeeping for just $US0.50 a month, which is pretty cool.
The service comes with a web interface to upload or download files into your buckets, as well as alerts for when you're reaching a storage limit you said. If you need to download a big bunch of files at once, you can get a flash drive with your files sent to you (128 GB) for $US99 ($137) or a USB hard drive (3 TB) for $US189 ($262).
In any case, if you sign up you'll get 10GB of storage to try B2 out for free.
B2 Cloud Storage [Backblaze]