Looking for used Sony transformer for Trinitron TV. Part is no longer available new, so have to find one from used set. Can anyone help?

I need to find a transformer for my Sony Trinitron (27" TS35). The part number is: 1-439-502-31. This transformer is no longer available through Sony, so I need to find one out of an old set. If anyone has any leads (has one, or knows of shops that stock "graveyards" of old TV's, etc.), please let me know. Thanks!

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