Kodansha Comics has kicked up a new sale on ComiXology (which doesn’t duplicate on Amazon Kindle, sadly) with Yukito Kishiro’s Battle Angel Alita manga series.
The first three volumes are part of Amazon’s Kindle Unlimited program as well, which gives you an option there.
Still, the books are priced to own well at $4.99 per volume and it gives you a good chunk of material to check out.