I need someone to proofread my novel

Description

I am a New Zealand writer looking for someone who lives in or is from the United States to proofread my novel to check that my word usage is consistent with American English/slang etc.
I am an editor myself with 20+ experience so all the editing has already been done, but I will appreciate any additional feedback or notification of any errors you might spot.
It would also be helpful if you are familiar with Hawaii, particularly O'ahu as part of my novel takes place on that island and though I have done extensive research I haven't actually been there.
The novel is 105500 words and I realise my budget is very low, but as I say, it has already been extensively edited so you'd mostly be checking spelling, punctuation, word usage and for any obvious errors I may have missed.
The story is a romance, but not chick lit or sickly sweet. It's also about second chances and how we often make wrong assumptions about people.
I am happy to provide a sample on request.