Audiobooks are just expensive in general. A song of Ice and Fire is $39 in Audible on android (well it's on sale now for $27). Sadly $20-40 is a fairly normal price for a audiobook.
Yeah I think they are though artificially inflated by Amazon and co since why on earth can Audible sell them 8$ every month. Luckily there are a lot of old public domain books that you can listen to. Reading what Brandon Sanderson has to say about Audible to me was really revealing.
