Expand your search for walking staffs to include your hardware store where you can buy a replacement tool shovel handle...
FYI, test it before you walk out the door with it. I purchased a 1 1/4 inch diameter ash handle to use as a heavy duty walking stick, but it was so clunky it ended up in the scrap material bin.
As far as the drug store walking sticks go, there's two items you might find interesting. There is a style of walking stick with a
T-handle that are better off pavement than the drugstore ones. And two, there are
martial arts specifically for the geezers sporting a crooked top cane.
Off topic, but of historical interest; there is a tale that in 1835 Andrew Jackson responded to an assasination attempt by Richard Lawrence by bayoneting him with his cane.