What is the best method for aquiring jade?

I am trying to get &quotA name whispered in darkness 4&quot and I need 1000 jade to proceed. I have Watchful 76, Shadowy 45, Dangerous 62, and Persuasive 55. I already have 305 pieces and can buy 500 more if absolutely necessary, but that leaves 200 more to grind.

Working for the Widow (Spite) pays in Jade, as does Donating your body to science for an hour or two. (Watchmaker’s Hill.)

Is there a better way after becoming a PoSI?

An option opens in unfinished business in watchmakers hill that gives a steady supply of it.