I've been using my TZ3 at this house with a lighter-med. 41 ft. oil house shot and it's been amazing since I got it. Current average of 229. My first series out of the box last season with it was 814. I probably have 100+ games on mine and it's still just as good as when I got it. I wish Motiv would/could make something similar so everyone could enjoy this ball. It's reaction is not a typical skid/snap but it carries at a lot of different angles, light hits send pins flying and flush hits split the 8-9 in half.
I have another 15lb. NIB saved in my closet when this one finally wears out.
I paid big money to get it from a guy in Canada, so it would take a big offer to part with it. Good luck with the search, if I see one I'll let you know. Use the Motiv Bowling Forum and put it out there that your looking, that's how I found both of mine.