I bought mine from firstname.lastname@example.org
in '93 for the same purpose. Ran walleye charters for years out of Geneva Oh. I am still using them in the Atlantic today. Over the holidays I was in the area and bought 3 additional rods and 1 reel for me and 4 trolling combos for a neighbor. Tom will have some in about every price range, but less than comparable anywhere. He is probably within an easy drive for you. If you go plan on visiting a fisherman's candy store like no other. Or he can ship.
15# - 18# rods about 8 1/2' will work well, I'm using 10' now. Either trolling rods or downrigger rods. I know you can get them for about 1/2 the price you are talking. Tell him Captn John sent you.