Depends on a few variables such as whether or not the site you want has electric, whether you're staying in a cabin or towing in a camper/tenting, etc. There may be info on the DCNR website but I'm not 100% sure. But you can check out this link I found for reserving a spot. https://www.reserveamerica.com/explore/poe-valley-state-park/PA/880118/campsite-availability
Cheeper by the week $175 for no pet sites
All state park campsites start at $15/night and go up from there depending on electric hookups, pet friendly sites, shower facilities available, weekend vs weekday rates and so on. Poe Valley sites can range from $25/night to around $35/night plus a one time transaction fee.
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