But anyway, to give an answer, if you can buy them it should be relatively cheap if they drop (which means if someone farm that boss for tomes, he'll have the greens cheap).
If you figure out a build to farm your boss, the first one should drop in the first 10 or 20 runs (which is somewhere between 7 min and 45min for the longest runs).
SIdenote : I don't know if you are specifically after dwayna's grace, but Mysh, Lady of the Lake in drakkar drops a similar scythe, but with a scally appearance. SHe's easier to solo I think, tought that doesn't mean especially easy.
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