Could use Paid Subscription feature, and enable this for a certain duration (days, weeks, months, years). But, it doesn't support "per-post" functionality.
There are some classifieds mods out there, which may offer greater flexibility. But, they tend to be not as functional as the forums. Meaning they have a lot of standard fields that you may not use, and have no way to disable.
Overall, a lot of people have tried charging for classifieds, and i don't no of anyone who has really succeeded because there are too many free classified websites out there, which are as well known as twitter or youtube.
Most people, who attempt this, eventually refocus attention on adsense. Let people create free-posts, then focus on ad revenue from people viewing posts.
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