Exhaust all options, before you just toss the magazines in the recycling or garbage. You should get something for them, even if it's a little bit of cash. Or, donating the magazines to a local club, IPMS or otherwise, at the very leasts means that some other modelers can get some use from them.
If you have a little bit of time before you have to get rid of them, you might also see about getting rid of them at a local modeling show. Even if you sell them a dollar an issue, you'll have something, and some modeler will have something.