Whats the most you spent on junk?

I was spooked about this exact situation a buddy of mine paid 4000 for a project charger that had EXPANDING FOAM i. the frame to cover rust holes. I went under my car and poked the frame and floor pans with a screw driver to make sure i hadnt gotten duped.
I did exactly the same thing when I bought my 74. It's nice and solid underneath.