If cost is your primary concern, Jon, then I'd suggest one of the ones here. There's an ePub uploaded by AlexBell, and an illustrated mobi uploaded by HarryT. However, if you want to do an Audible version for this, I'd definitely recommend the
Nadia May narration. She's always going to get my vote, whatever name she's using for any particular work. (Real name,
Wanda McCaddon, two common aliases:
Nadia May and
Donada Peters)
ETA: It appears there is a second
Jane Eyre,
read by Ms. McCaddon under her own name, also available on Audible. The McCaddon one is about an hour shorter. Both claim to be WhisperSync enabled, and with a reduced price. Though there are so many conflicting versions, it's difficult to guess how you'll manage to get them lined up.
One concern I have for selecting this book is length. This is a long book. Audio versions are 17-20 hours, and while the listing here is for 490 pages, the hardcover edition on Amazon lists it as 656 pages.