Tracks/Leki Sierra AS walking staff

I need to replace a lost Tracks (Cascade Designs) walking staff which
served me well for over a decade. I have been told that these are no
longer available in Europe. Does anyone know of a retailer? (The
company's list on its website is out of date.)

Failing that, what experience have people had with the Leki Sierra AS
staff (http://www.leki.com/html/trek_travel_2091.asp) or similar
products?

I'm talking about single staffs and not about pairs of poles.

BTW, I really do NOT want to start another boring thread about "walking
staffs/poles/sticks are great" versus "walking staffs/poles/sticks are
[censored]". Please stick to the topic. (Said in the nicest possible way, of
course! :-) )

Cheers, Paul