I'm guessing that since you're looking for AA blogs, you're probably already using a tool like Scrapebox ... here's how I get cheap and good (but it's not fast).
1. I take my target keyword(s) and use keyword scraper to grab as many variations as possible.
2. I load the variations into keyword scraper and do it again (repeat till you've got thousands).
3. Load them into the harvester and harvest away. Make sure to pause it before you hit 1,000,000 results or it'll crash.
4. Keep going till you've milked the engines for everything they've got.
5. Remove duplicates
6. Run all the links through fast poster.
7. Check links.
8. Save your successful ones.
9. Trim the successful ones to root. You now have blogs that you know are AA.
10. Put the root domains into the harvester and include the "site:" operator in the line at the top. Harvest again.
11. You now have a bunch of pages on all those blogs that are probably AA. I wouldn't post to all of them all at once to check, maybe 3 every couple of days.
There you have it. The cheap way to get good AA blog lists.