It's my understanding you can mix common copper sulfate in water to make a fertilizer application.   I'm confident that would be the least cost method.   Don't do this folarly, but a soil application is OK.  One precaution..... do not let any solution with copper sulfate sit in your sprayer over night.   Flush your sprayer out each night.   I have no experience with this.  Only what I've been told.  

The copper sulfate product we've used with dry fertilizer applications is essentially a 25% copper product.  So it would take 8 pounds of copper sulfate mixed with water to end up with 2 pounds of copper.   Not aware of what amount of water is advisable.   I would likely try 10 gallons of water per acre.  


good luck,  gordon