As far as I know, submitting new exchanges and coins to Coinmarketcap is actually free.
Yeah, it's free, by means that it requires lots of requirements to be able to list on CMC, especially for 24 hours volume.
In any way, why don't you just message and propose your offer to those last 10 exchanges in the list of CMC, you can see it here
https://coinmarketcap.com/rankings/exchanges/4/.