#[0] so I found a couple suppliers that can get the ball bearings. If you remember the price you said, got a quote for just under half of that (though 2 of 3 sere above). Asked for 6mm, but as you can see here, that might be small. 2048 6mm (6.15 would be expensive since custom) balls will fill about 200 mL volume and weigh 1.8kg, whereas 8mm also pictured, will be about 4kg and fill 475mL (will have quote on those later).

I'm thinking we can get some nice Yeti style bottles and 3x space filled seems like it would be good for mixing. Might be possible to do first 4 letters of words, but tbh, would be a bit of a pain on communications side since people already know the sequence of integers.