I have five 4.5" balls for a big ball bowler. I would like to trade them for two - three 4.0" balls instead. See attached picture for what my big balls (ha!) look like. Please PM me if interested!
They seem to be offered by the St. Louis Ball Bowler company. Curiously they do not list 4 inch balls on their website though, only 3, 4.5 and 5.5. http://www.stl-bb.com/ball bowlers parts.html
Anyway, the ones on eBay are $50 a piece. I'm not quite willing to bite the bullet yet.
I recognize the odds of someone having 4" balls to trade for 4.5" balls is pretty slim, so I am open to selling the 4.5 inch balls as well. If anyone would like to make me an offer to purchase them, please PM me. Again, I have five of them, and I'd be willing to sell all 5, or perhaps individually, for the right price, if there's any interest!