Destructive chewer – gets bored with hard chew toys

Our 8 month old Springer loves chewing to destroy. We give her chew toys like Kong’s and Hurley from West paw, but she gets bored with them after about half an hour and moves onto something else that she can destroy, often a stick or ropes (ropes are the only fabric toy she gets now, but even with them she eats the string and it gets caught up in her poop and we sometimes have to pull it out). Can anyone suggest anything that won’t matter if she eats that she can destroy on a daily basis that doesn’t cost the earth?