Make me take my book out why don't you? *spends all the effort to reach 2 feet to the right* UGH.

do you want a fishing net, or the barbed trapping one (which is 20gp)
a fishing pole with a very basic reel attachment would be practically a quarterstaff if not even cheaper cause they wouldn't need to do much to the wood to make it fancy unless it was a fancier one. i'd say you could get one for 5 gp likely. and it'd only be 5gp just for the uhhh.. mechanics? instrumnents? oh goodness i've forgotten what they're called the bits and bobs that turn it into an actual fishing pole.