Does anyone know wher to get a xr75 motor??

[matt9923]

preferably a 1977 but ma** a 1978 i have oarts for a 77 so...
I tried ebay 3 times and somone always out bids me at the last second no mater how dam high i go!!!!! anyway does anyone know were to fined one in good condition. i have 1 of them but it looks like it was hit with a sleg hamer and droped off a building. I dout i could fined a new one but ma** a used one that has light use or even a restored motor?