I purchased a replacement knob from AppliancePartsPros. There are three things to note about my experience with AppliancePartsPros. The replacement knob arrived in one day (hard to believe), the price was less than other sites, and the online video on how to replace the knob was very helpful. I didn't have to remove the entire control section, but the video pointed out I needed to depress the piece inside where you snap the knob onto for it to go on all the way, as well as to remove the broken piece still attached. The standard shipping cost of $8.95 seemed high, but as noted it arrived the next day. That cost was certainly much less than a service call, so it was well worth it. Also, their website was very easy to use.