If the rope will be FOR RAPPELLING ONLY, you might be able to get a serviceable one used from a conscienscious and reliable seller, FOR RAPPELLING ONLY. A rope retired from climbing use may still be in fine shape FOR RAPPELLING ONLY. I hope you caught my emphasis above. You would have to trust the person selling you a used rope to be honest about this history of falls it has taken, how it has been treated, etc.