I do enjoy the 2-for-1 sales. Audible never makes its entire inventory available in these sales but selects a couple of hundred titles to offer. Some sales I find nothing and some I walk away with hours worth of listening.
Please don't read anything into my choosing both Roughing It and The Virginian. Slowly but surely, I seem to be consuming more and more Twain, and I especially like his travelogues. Meanwhile, The Virginian (and Steppenwolf, too) are returns to high school reads.
Then, to round out my choices, there is a "Great Courses" lecture series on Classic Novels, which will either be very enlightening or just simply pompous beyond bearing.