I was thinking doing the same when copper hit 1.29 in 2016 (for the simple reason that below 1.5$ it's undervalued).
After doing some conclusive research I came to the conclusion fuck that shit there is no way I have enough space to store any of it....
I just did some calculation right now so stay with me brother.
- The face value of one penny is 0.01 cad (of course).
- The price for a pound of copper with the market today as I write this is 3.13 usd so 4 cad
- There is 145 canadian penny for a pound. so 1.45 would be the cost of buying at face value and the selling would be at 4$ for a pound
So you could double your investment everyday, considering that you could sell copper and change penny all day, based on those numbers, but the practicality of this system would need further work... :P
Yeah, you get alot of the zinc and never pennies as well, which you then need to sort and return or discard. which would limit the utility of this plan, but otherwise your exactly on the right track.