Paul good luck with your search a few years ago i bought my first pin off ebay a Stern Magic for $800 bucks at the time i knew nothing about pins and whilst removing the backglass managed to break it ,
After searching everywhere i found one in good condition at Bumper by the time it got here it cost me $450 .
I wasnt happy paying that much but i was lucky to find one.
I literally shit myself whenever i remove that backglass now.
Good luck
John