Ignition! has also now been reprinted and is well worth the purchase and read.
Cool, when I read it it was pdf or $300 used copies.
I have a rusty, high-school knowledge of chemistry and Ignition made me love it (well, the part of it that is prone to explosion and corrosion). And I confirm, it's available in paper form.
That's a good option, though I also enjoyed the audiobook of Ignition! on Audible.