Crindle,

You can post a free ad here on RCU, like CGretired said.

If your "Kit" is balsa sticks and sheets and plans, post an ad for twice what you gave for it. You'll probably get it, or a reasonable offer higher than what you gave.

If your "Kit" is a prebuilt ("Almost ready to fly") of any type, try for what you gave for it. You'll be lucky to get half, unless it's a rare bird.

If it was a gift or inheritance, try the electronic auction site.

And, if it's not complete, it's not valuable, just offer it to the guys at your local club as a donation, they'll probably take it.

Just my opinion,
Dave Olson