Donate to Goodwill/Salvation Army if a library won't take them.
And when you say they are worthless on Amazon, do you mean there are 20 listings at $.01 each? Or something like $3-$5. Because once you get over a couple bucks you can make a small profit by selling them (you can ship books dirt cheap using the postal service's Media Mail).
Also, check the item on camelcamelcamel.com to see its price history. Depending on the item the value might change drastically depending on time of year. So it may be worthless now, but come August, they might go up to $10-$15 (or whatever). Then again, it might truly be worthless as well
Honestly, if you have no immediate use for any of them, just get rid of them. No sense filling up your house with useless and worthless crap. If you need them later you can always buy them for $.01 on amazon