Welcome!
$800! I don't personally know where you can get the seal, but I would be looking at any alternatives I could. I can't recall anything special about those seals when I had pop-up campers. There are lots of different types of seals available at home improvement stores. You might find something that will work.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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