When the timer went bad on my old Whirlpool gas dryer the local appliance parts store wanted $172 for a new one. I found this one on Ebay as a new/open box part for well under half that price. It appears to be brand new and identical to the original timer, installed it in 15 minutes and it works perfectly.
We have a very old dryer and the cost of a new timer may have been more that it was worth. For a third of the cost of a new timer we were back to running again.