Paludarium start

Yay, my new aquarium has arrived for pick-up so I can start designing my
paludarium. Anyone have any ideas on how to get good pieces of wood at
reasonable prices? Stores around here want $20 for a little piece. What
kind of ordinary wood will be okay (if any)? Can I boil or dry certain
woods to make them safe? Anyone have a nice big swamp behind their house
full of choice pieces of root? :)

in Vancouver