Hello. I too find that zip ties get brittle and need replacing, usually at the most inconvenient moment. However, I always had a ready supply, since so many groups used them to put up adverts on lamp-posts and telegraph poles. Later they'd rip the posters down but the zip ties tended to stay. Before retirement, on my way home from work, I'd take a craft knife and cut the ties at a sensible place, so there was a fair amount of "tail" left and they were reusable.
I presume someone will reply with a comment about how mean one can be! Rather than tightfistedness I saw it as recycling and ridding the countryside and town of stuff that wouldn't biodegrade. Nevertheless, I'll get that "meanie" reply but I'm thick skinned!