Active Surplus in downtown Toronto has a bin of them. We actually picked up 3 of them yesterday ($1.14 CDN each) (~3.5" linear motion).
They are 50K, not 100K, but I'm sure we can make them work somehow...
PM me if you it looks like you cant find them anywhere else, I'm sure our team wouldn't mind helping out
(of course, I'd have to talk to our team leader)
Cheers!