I got one for $5 last year. The guy only wanted $2 for it but I felt bad. Probably the only good deal I ever got on a keyboard though 
Perhaps 2 years ago (and at least a year after Soarer's Converter was viable) I was the only bidder on a couple of them in the $1-$10 range + $10 shipping or so. One of them may have been missing a couple of keys.
With what seems like a buckling spring hysteria happening these days, I am still mystified that ATs are still selling in the $100 range, there is no comparison in the utility and convenience of an AT compared to the XT, even if the XT has a barely perceptibly better "feel" ....