Prison Wallet -
The one I have I got for xmas several years ago....the people who bought it probably spent $40-55 on it. I don't have the box anymore, but it says 'Speed XL' on the backside...I googled that model and found the same price variations as you did.
Needless to say, I had two electric razors before this one that straight sucked. Always left some spots or weird long hairs. This guy that I have now has been extremely dependable, it takes about 90 minutes to recharge and gives me the best consistant shave out of any of the electric razors I've had before.