Hey, #LazyWeb: does anyone have any clever ways of finding replacement parts for luggage?

I have an old but still very good-condition #Travelpro Crew 8 bag, and the retractable handle system is busted. Replacing the whole bag is upwards of CDN$300, so I'm really hoping to replace the handle system instead.

I've check Amazon and Ebay, of course. If you have any other specific places to look, I would be grateful