If you can't find one what you could do is set up a separate usergroup which people need to pay for which have the same privileges as regular users, but are able to create new threads in a specified forum.
Set up different amounts like $2 / day, $10 / month etc. etc. and once people pay that fee they will be moved automatically in that usergroup (and also moved out of that usergroup once their "time" is up) and they can post in said forum.
Just a thought?
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