There's no rush. I ended my subscription service and still got to keep my remaining credit.
The best finance book I've read hands down has been A Random Walk Down Wall Street. Many of the others haven't said any more than what's readily available on finance blogs (and have said it with equally unimpressive writing).
If you're interested in broader things like how the 2008 crash happened and why it was such a mess afterwards, I'd recommend Neil Barofsky's Bailout.