I have two solar roof vents for sale in north Houston. New they are about $750 (see link below for model info). Had them on my roof about a month ago long story short I had to remove them because I didn't know I had a sealed attic (don't ask). Looking for $250 for each one (can buy one or both).

https://www.bestmaterials.com/detail.aspx?ID=29624&utm_source=google&utm_medium=cpc&utm_campaign=%28ROI%29%20PMax%20Shopping%20-%20High%20AOV&utm_id=18029413835&utm_content=&utm_term=&gad_source=1&gbraid=0AAAAAD_W959n_-jME0skiUAql6yM9SCx4&gclid=CjwKCAiA65m7BhAwEiwAAgu4JPlHficfYy0DHDGl7W8BUPSS-4i0KIasAJYN_GO3CR0vULt_vrUSURoC6G4QAvD_BwE