I had around 1,000 magazines, mostly gaming, that I finally got mostly rid of five years ago.
First off, Frank Cifaldi (magweasel) never replied to my attempts to see if he wanted any of the issues I had. Considering I had some fairly rare stuff I think he just wasn't interested in dealing with picking up random scraps or something. Oh well!
Otherwise just look to eBay or other methods. I ended up making around $700 from those I sold. I mostly did them in lots of 12-20 issues (mostly did year bundles or combined partial years). Also, be fairly exact with the condition and be willing to take pictures and collectors will be fairly quick to snag them up even if they're not in great condition.
It takes some time and effort but anyone with stacks of magazines should be able to make some simple spending cash. Maybe not anything big but it beats just recycling them.