There's quite a few to choose from. What caught my good-deal eye was:
https://www.logos.com/free-book
Which (I think) is twice a month. Anyway today's the 15th and it looks new. Take a gander.
And for NT text-type aficionados:
https://www.logos.com/product/53845/the-beginnings-of-christianity-the-acts-of-the-apostles?ff_showPdpAddSubx=true
Which is a 7-volume (not 5) set packaged by, among others, Kirsopp Lake. Normally $99 (sounds wrong), it's on sale for about $13-ish (excellent price).
Text-type-wise it's has early discussions on the so-called Western Text as regards the Acts text. But even better, two Ephrem the Syrian volumes on Acts. How's that?!
