Have you tried your LBS (local bike shop, I'm used to cycling forums)? Often these shocks are rebuild-able, hence the cost, even if it cannot be rebuilt, they may have a good take-off from another customer's upgrade.
Since this site is all about economy, a rear shock is a huge energy waster, if you are not riding off-road you could convert to a rigid rear end. A piece of tubing with 6.5" holes would accomplish this very inexpensively, adding a heim joint would allow ride height adjustment, but would be more costly and take fabrication. This will at least get you back on the road while your search for a new shock continues.
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