miked 
The cheapest I have seen it for in bulk buy of 100kg+ is $1.96lb. Most likely it is The hydrated blue copper sulphate that Mike is speaking of. This means he has an approximate weight of 1047.3 lbs of CuSO4.5H2O
now with a value of $2052.71.
With smaller volumes ie 5lb bags, prices are as high as $4 a lb giving a value of over $4000.
Again this assumes all space in the container is occupied. Please allow a small amount for the gaps between crystals. Also if it is just copper sulphate is just waste the solution then the darker blue it is the better but I wouldn't offer very much at all and probably not bother unless I got it for next to nothing. That is unless he can tell you the solution concentration.
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