It retails for over double that so yes it is a good price. The caveat is that buying from the used market it will not be covered under warranty. As long as you receive a fully functional speaker from the seller, then yes it is an excellent deal. Get an idea of what the seller is all about before moving forward. Make sure the shipment is insured and ask how he would package the speaker(limit the chance of shipping damages). A cardboard box, garbage bag and packing peanuts won't cut it.
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.