Need rear shocks anybody know how to get them for less than a root canal?

I broke a rear drive axle u-joint, so I have it all apart and I discovered that the passenger shock was mounted backwards and had broken itself. I'm guessing the factory did that, but it could have been the previous owner. It was obviously wrong because the bump stop didn't even point at the frame.

The shock is a Showa 100401, and appears to be a typical $15 shock if I could find a car with it, but I can't. It looks like I can buy rusty, used shocks for about $100, or new ones from...

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Need rear shocks, anybody know how to get them for less than a root canal?