My proposal would be to record chapter by chapter and send it to you via WeTransfer as both a wav and then, once any revisions are finalised, an aa file, fit for AudiblePro.
I have all the equipment required for voice acting, incl. Logic Pro X for recording and mixing as well my Superlux condenser mic with sound shields for background noise free audio.
This whole budget would be for the whole 3-day delivery, recording time and mixing.
If you would like to contact me via the chat function, I can send you a few samples of my voice reel, as I can't send them through the bidding function at the moment.