Smyth almost for free on Amazon: A Greek Grammar for Colleges Kindle Edition, ASIN : B07X27CKXC
Publication date : August 28, 2019
You might see another, earlier Kindle edition, which is apparently very poor. This is very good.
And, to anticipate, the available versions on Internet Archive are poor quality scans. This version has clean, clear text, a detailed table of contents which is clickable, and costs just over 1USD.