It surely doesn't require $250 in tools to replace a flexdisc. I dropped a whole driveshaft out of car in 10 minutes at the pick and pull with 2 wrenches which is all you really need. You could straddle a ditch or put one set of wheels up on the curb and wiggle underneath to do it. Is that worth $250 to you?
It's not hard. I'd put it on jackstands, do it myself and put the $250 towards another canoe.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13