Did you know you can save a search on ebay and be notified when your item comes up for sale? Just type in your search and look for the button to "save your search". That's probably your best bet. I'd recommend you simply save a search using the model number. Your part will probably come up for sale one day.
Another option is an ebay seller called "niftythriftygirl". You can find her shop on ebay by doing an advanced search of her seller name. She sells a lot of Kenmores and may have your part.