It's become more commonly available at higher end performance shops, as their customers are running wider tires with thinner sidewalls, which tend to exacerbate balancing issues and there is no "softness" to dampen any issues that come up.
Honestly though, I've seen it for ~$50 but not for $100. There's not much additional labor involved, it's simply the cost of the machine needs to be amortized so they increase the per-wheel/tire cost.
I think some shops are still figuring out what they can charge for it. Kinda like shops that offer to fill your tires with nitrogen for $25.
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