Haha, $100 for a 1390120. Regular M's should be in the $40-60 range, to me.
$60 is fair for that XT.
To me, the 1390120 is a good parts donor for its heavy plate, etc, but less desirable than other Ms because of no LEDs.
I had trouble selling a couple of clean, tested, XTs in the $35 range last summer.