I think 1kg of pure copper for $90 retail price is perfectly fine if you need a piece of pure copper for DIY purposes.

Sometimes it is hard to find raw materials with certain purity. Unfortunately, they have no titanium, tungsten, aluminium, zinc, lead, tin and other bullions made with definite purity.

I personally, could be interested in aluminium and zinc bullions with .9999 purity.

I think 1kg of pure copper for $90 retail price is perfectly fine if you need pure copper for DIY purposes.

Sometimes it is hard to find raw materials with certain purity. Unfortunately, they have no titanium, tungsten, aluminium, zinc, lead, tin and other bullions made with definite purity.

I personally, could be interested in aluminium and zinc bullions with .9999 purity.