It's difficult to tell which models they are but I will hazard a guess based on the washer buttons that it has the larger tub and two speeds. Dryers drums were all the same size.
$100 is a good price for a set like this, but a dryer timer could be hard to find and the "unspecified" motor (or ???) problem could be an easy fix or a big repair. If you and/or your husband are handy, it could be worth pursuing. He can come back here for advice.
Otherwise, if it's not an urgent situation you may want to hold out for machines that are known to be in proper working order, which can be found for not much more money, and save yourself some potential headaches.