Here are two extracts from the audio book:
The audio book is available from a number of distributors including:
In the UK:
https://www.audiobooks.co.uk/audiobook/snakebite-blues/440707
https://books.apple.com/us/audiobook/snakebite-blues-a-bus-trip-beyond-the-frontiers-of-the-mind/id1518218183?mt=11
https://play.google.com/store/audiobooks/details/Martin_Gerrish_Snakebite_Blues?id=AQAAAEDssUvxtM
https://www.estories.com/audiobook/377307/Martin-Gerrish/Snakebite-Blues
In North America:
https://shop.authors-direct.com/products/snakebite-blues?_pos=1&_sid=f584cf687&_ss=r
In Australia:
https://www.booktopia.com.au/snakebite-blues-martin-gerrish/audiobook/9781662241222.html