Robin Nuttall said in rec.pets.dogs.behavior:

Stuck-in-ground weave poles work well for me, though they
have to go in before the ground freezes. Electric fencing
poles with 3/4" PVC slipped over the poles (less than
$20).

Depends on dog size and drive. For smaller dogs and for
just starting out stick in the grounds can be fine, but
I've learned from my own big dogs that it's best to
graduate to stiff poles as soon as possible.

Both Friday and Rocky pound through my stick-in-the-ground
poles; maybe it's because my soil has been really compacted in
the weave area (and that it contains a lot of clay), but the
worst that's happened has been the odd pvc tube being flung off
the fiberglass pole.

--
--Matt. Rocky's a Dog.