conversation, whosampled.com, youtube, and Gilson
All of these, especially the last one. Always led to new stuff because of Gilson. Pay attention there. Guarantee you'll learn something. The-Breaks is a good resource as well as the Sampleur site. I also spend time researching about the labels that I like, session players, etc. And also a lot of times I'm just looking for things I've known about and wanted for a long time and just either haven't found yet or haven't had the money to buy it at the time.