Your book will run about 7 hours, and I charge a prep fee plus $250 per finished hour to prep, record, proof, edit, and master an audio book (to meet or exceed ACX standards). I have over 20 fiction and non-fiction books to my credit, many available on audible.com.
Here are some samples (Send me 500 or so words for a custom sample):
http://www.audible.com/pd/Kids/Hamilton-Troll-Meets-Pink-Light-Sprite-Audiobook/B017KSDJ7U/ref=a_search_c4_1_8_srTtl?qid=1474505970&sr=1-8
http://www.audible.com/pd/Sci-Fi-Fantasy/The-Dragons-Bond-Audiobook/B00RB0C81G/ref=a_search_c4_1_1_srImg?qid=1449931010&sr=1-1
http://www.audible.com/pd/Sci-Fi-Fantasy/The-Eye-of-Mezitlan-Audiobook/B017JAJDZ6/ref=a_search_c4_1_2_srTtl?qid=1449931010&sr=1-2
http://www.audible.com/pd/Mysteries-Thrillers/The-Coming-of-Jacob-Saunders-Audiobook/B01H0OZPIK/ref=a_search_c4_1_1_srTtl?qid=1480169821&sr=1-1
http://www.audible.com/pd/Nonfiction/The-Best-of-the-Empty-Nest-Book-2-Audiobook/B01F7SOKPU/ref=a_search_c4_1_2_srTtl?qid=1462911682&sr=1-2
http://www.audible.com/pd/Self-Development/Top-Ten-Ways-to-Build-Lasting-Relationships-Audiobook/B01H60MKWM/ref=a_search_c4_1_1_srTtl?qid=1471897478&sr=1-1
http://www.audible.com/pd/Self-Development/Writing-Deep-Point-of-View-Audiobook/B01K7TNDTI/ref=a_search_c4_1_1_srTtl?qid=1471606830&sr=1-1