Voice over under 500 words - Upbeat Game Show - Motivational

We're creating a video to incentivise a young sales team with the trip of a lifetime and we would like you to supply a voiceover for it.

The voiceover must balance the excitement of a whopping big prize with full-on sales motivation. For a purpose-driven company, there will be footage intended to be very serious—and tear-jerker moment before ending with a big ra-ra.

Things we would like to know:

What would it cost for a script that is just under 500 words?
Can you supply two versions, one normal and one with slight reverb?
What is your policy on amendments if they are needed?