How much is a US 1950 20 dollar bill worth?

I'm looking on eBay and - depending on the condition - seem to be going for about $40.

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Unfortunately eBay isn't always a good indicator of actual market value because asking prices can be all over the map depending on the skill and honesty of the poster. As of 05/2014 an average of auction prices across multiple sites shows circulated bills selling for closer to $25, while uncirculated ones can bring the $40 amount cited.