Hey guys if anyone needs empty spools we have a variety of spool sizes. Each spool is $.50 + Shipping. Contact us for more details.
support@jmotechnology.com
Thanks.
Have you tried Craiglist? Might have better luck offloading them locally there. Be sure to put some uses in the description such as being able to wrap up christmas lights on them. Maybe reddit too at https://www.reddit.com/r/3Dprinting/
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Not sure what your shipping rates are we donate our spools to http://thegeekgroup.org/
Everyone has a few to a few hundred empty spools a month if you manage to sell them for $0.50 I’ll send you all of mine for $0.10 EA 
Thanks, I’ll look into donating them, I haven’t been able to sell any yet.