I was able to bring home the "new" used stove last night. Just in time, too! The disappointing news is that I've swapped one problem for another--one burner won't work, even after switching the element. We may be able to fix it ourselves, or we may have just made a $50 donation to Thriftsmart. (Which would be okay, as 100% of its profits fund the Mercy Medical Clinic and African missions.)
There is always risk in buying secondhand appliances. Generally, it's been worth the risk to me.