Geode price help

[Pinball]

I bought these at an auction years ago and have given many of them away as gifts. I would like to start downsizing a little around here and wanted to see what kind of price would be fair for the lot in the pictures. I think they are very interesting but I just can't keep everything I bring home. If they are only worth a couple dollars maybe I could take them to a school and they could use them in a science class. Thanks for any help.
Scott

 

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[IAMZIM]

Personally I would only imagine $3-5 bucks a piece on those, but that is only the price I would try to sell them at if they were mine, so I don't know how much help that is for you! Some of them are kinda cool though!

 

[Pinball]

Thanks a lot...that does help.
Have a safe Holiday,
Scott