Do you have Ebooks for rental for a Kindle?
It varies by vendor. IU East and Ivy Tech both subscribe to a number of ebook sources, but the largest are eBrary, EBSCO Ebooks, and Books 24x7. Of those, EBSCO Ebooks does not allow downloading to a Kindle at all. Books 24x7 allows you to download a few chapters at a time (not whole books), and eBrary allows full book downloads, but they require that you put software on your Kindle first to be able to access it. Their FAQs for how to do it are here:
EBrary is the largest of those ebook collections, so I recommend starting with them.