I used the green powder that came in a 25 kg bag. I think it was some sort of organic farming fungicide. Copper oxychloride. Lasted me for years. Mixed OK with manganese and magnesium.
The red/brown Cuprous oxide products always gummed up my sprayer big style so I avoided them.
Headland Brock or YaraVita's offering for this. I used a combined manganese & copper Mancuflo on spring barley (or Brock). These are suspensions which makes them hard to get out of the can but they are compatible with more other pesticides than the chelates which can cause more trouble than the odd blocked nozzle!
Have you had copper deficiency confirmed @willy ? The late application of some hormone herbicides can do this too.
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