I tend to have cane tips around the house anyway, so often it's just a matter of looking in my collection of old and new tips to decide which one to use. They can also be ordered from a number of online (non-musical) sources with pretty brisk delivery.
And yes, most of the cane tips that I use have nice solid metal washers inserted. (For those tips that don't have a washer, inserting a nickel works pretty well too.) With a washer, the sharp tip of an endpin seats very nicely inside the washers, preventing the endpin tip from putting a hole in the rubber cane tip. almost as if they were made for each other. The only trick is getting the right inside diameter cane tip for the endpin.
They do make canes with retractable sharp ice pick tips, which incidentally fit right through the washers in the cane tips and intentionally perforate the rubber of the cane tip when in use. I have one of those canes, but totally removed the sharp ice pick mechanism so it will pass through various security checks without raising eyebrows. Ice is pretty rare in my locality lately, while security checks are pretty common.
I do use a cane for long walks or for uneven ground. Otherwise I consider myself lucky not have to use them all the time. Happily, with a Bass Buggy installed, I can use the double bass itself to lean into while walking and it provides remarkably very good walker or cane-like stability, and then I can play it with pretty normal posture either standing or sitting. A person just has to be careful about high-centering the Bass Buggy in deep sand, gravel or high grass -- don't ask me how I know this

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Cane tips do wear out, but much more slowly on a double bass endpin than on a cane, at least for me.