Offered for sale since they are not in rotation, and need a sub for excellent desk, bedroom system. $100 shipped US-48 and AK. I'm in Oklahoma. Rebuild seen here... https://forum.polkaudio.com/discussion/199034/b-o-c30-rebuild?utm_source=community-search&utm_medium=organic-search&utm_term=B%26O" rel="nofollow">https://forum.polkaudio.com/discussion/199034/b-o-c30-rebuild?utm_source=community-search&utm_medium=organic-search&utm_term=B&O