I just finished making a new DS rod for a Nacra 5.7, total cost $16.75 and two beer.
If you are on a tight budget, they are pretty easy to build. I picked up a piece of 9/16" SS grade 304 rod at Metal Supermarkets for $16.75. It was a simple job to thread it(fine thread)to fit the nuts.
The biggest part of changing the rod is getting the old one out. If you have a large set of bolt cutters you can cut the old nuts off, there is no way to remove them if the rod is bent even a little. To save $5/nut, cut the rod just above or below the nut,(where there is a straight section leaving clean threads)& remove the nuts for reuse.
I posted a sequence in the tech help for anyone contemplating the job, though it is pretty straightforward.
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Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
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