Just a reminder that Audible's
Buy 4, Get $10 promo is still going on and will expire in two weeks. There are many ways of getting those four audiobooks. You can use any combination of credits, member discounts, sale prices, or Whispersync purchases to get there. Just remember, that you get credited for a qualifying purchase if the regular price is $14.95 or more. It doesn't matter what you paid for it; even if you got it free.
As for me, I qualified in a matter of minutes by purchasing four Whispersync Classics for $0.99 each. When I get my $10 credit, I'll buy another 10 of those $0.99 Classics. In the end, those 14 audiobooks will cost me a mere $4 total.
For those interested in some low cost options, here are some Whispersync links to many audiobooks that would qualify for the $10 credit:
Note: Whispersync purchases require the purchase of the corresponding Kindle book first. In the case of the 54 classic titles (above), all of the Kindle books are free; since they're public domain.