I'm normally not very respectful of "copper bullion", but those are some really cool designs! And right now I'd be a bit disinclined to buy five-ounce silver chunks, never mind gold, so... hmm.
I know industrial demand for copper is strong and some CAPX projects are in the gutter right now but I would think you should be able to find the copper stuff. Saw a few people at FUN with lots of copper trinkets.