It's a good child's detector. Walmart sold them in 2008 for $23.97. They have gone up a little since then. They are even as much as $75 in some places, but I can't imagine anyone spending that much on one. Good luck with the sale. With Christmas comming, this is the time to sell it.
I got the exact one for my 5 year old son last christmas at a sporting goods store for 35.00. Its good for a small child, only goes a few inches deep,good for tot lots and such.