Now that's what I call a find. Did you get it all up and running properly?.
As for me, The best find I have had is completely non arcade related. It cost $8 and It's a signed limited edition cat print by braldt bralds "Bag ladies" We picked it up on holiday in Florida last year, took it out of the frame it was in and handed that back in to the thrift store

When back home in the UK I tried to fit it into the largest frame I had and had to trim 5mm off the bottom. The wife wanted some more prints by the artist so I look it up online, Current price to buy $687