I've purchased several on eBay where I can buy them, mostly used, quite reasonably. I'd like to get "In The Heart of Sea" but it's a little pricey right now.
I listen to quite a few per year, I've been an audible member since 2012. You could probably do the free trial on audible, I think you can listen to 1 book and they have" In the heart of the sea". just sayin, worth a look.