I sold a lot of Copper US$1800 just as the prices started to drop. 19 months ago, pure chance of timing though.
I have not sold Iron for about 8 years because of a deal where I gave all mine in exchange for 'picking rights to the nonferrous' at a scrapmetal drop off point.
Since then our prices have not dropped as much as in America because of the changing US/NZ dollar (NZ was 90 cents, now 66 cents.)
Now I save up about $60- $90 worth and sell it.
I do the same with Brass and Copper domestic and Ali. Am concentrating on
escrap for a good payday at some point.
Escrap gives up plastic coated wire, various Copper in small amounts, and Ali. And light gauge since I can sell it myself now (scrap dropoff yard closed because of non viability)
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