It takes some time to sift through the inventory, but there are some nice properties worth considering.  

My problem is I do not want to have to sift through 10000 leads one by one to get rid of the DNC and litigators prior to exporting into my CRM. 

You've read some real estate books, sifted through real estate forums, watched videos but it's been months or years and you haven't done it yet... tell me why and I can point you in the right direction.

Or do I sift through sites like craigslist and zillow?

If this is the first time you have done it, it may take a while to sift through all the information. 

What struck a chord with me is what I have seen many times when I owned RE brokerages certain agents sifting through the listings as they prepare to show clients houses and tossing the one's that don't have 3% BAC on them.... and STEERING clients to only those homes that pay the 3%...

Make sure to sift through all the free info available to find answers to your questions. 

Prices of NPNs have gone up considerably and so investors looking to purchase NPNs one at a time must sift through many assets to find the small handful with solid profit potential. 

@Logan Allec - using a call answering service (VA, PATLive etc) sifts through these time-wasting calls (& texts) and allows you to get to the motivated sellers.If she's a "typical" English lady, she'll appreciate a polite response, but I doubt if it'll come to anything soon for you - I'm from England too & I've dealt with these lovely "English Rose's" for many years while working as an electrical contractor in England - they're tough nuts to crack!

And isn't this after the wholesaler spent money marketing for distressed sellers, d4d, cold calling, sifting through ads, writing offers and whatever other means to construct a deal.