fer100-
You can get a piece of 5/8" round stock steel from Home Depot or Lowes and make a driveshaft yourself. If you have an old coupler it can be used for a centering guide as long as the holes are still close to 1/4" and not too wallowed out. Get the measurements from your old driveshaft and be careful to get them as close as possible if not exact. Setting up a jig would be the best thing to do. The parts need to be clamped and you need to use a drillpress. It takes time and can be a head scratcher but it's very doable.
As far as the discs are concerned, most any machine shop should true them up for around $10 apiece if not less.
Hope this helps...
Wayne
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