Even though I have both Zerwick's Grammatical Analysis and his Biblical Greek, Illustrated By Examples in print form, I bought Grammatical Analysis at the Christmas 50% price.
Sadly, though, I can't buy Biblical Greek, Illustrated By Examples separately, This is too bad, especially since Grammatical Analysis is frequently keyed to it.
I don't want the entire Introduction to Biblical Greek Collection http://www.logos.com/product/3871/introduction-to-biblical-greek-collection, as I already have more introductory NT Greek grammars than I can count, and Swetnam's grammar gets poor reviews at Amazon - plus, you can read much of it at Google books, and there's nothing special about it.
I wish Logos would break out Examples and sell it for a good price. I'd even pay the full $22* to have it in my Logos collection - if it properly links to Grammatical Analysis, and vice-versa. (If it's not hyperlinked throughout to Grammatical Analysis, and vice-versa, it loses much of its value of being in electronic format - but I can't tell from the Product description pages if that's been done, though.)
* It now retails for $22 ($11.28 at Amazon).
If you've never Examples, it's a great 2nd-/3rd-year NT Greek grammar book. If Logos won't sell it separately, buy it at Amazon - it's too inexpensive to do without.