Free: Contests & Raffles.
Also tagging along to learn from more experienced bear hunters. In a few years of trying, I've had a lot more success with spot and stalk in the Cascades above tree line in September, where bears are visible and gorging on berries (could be earlier this year). My general thought is bears with an ample, high calorie food source would be less susceptible to calling (or less willing to come into a far away call) than those without -- like calling would be more successful in spring or in October than in Aug-Sept. But maybe that's because I suck at calling!
I have virtually no experience hunting bears, but did call one in once using a lost calf call from a tree stand. He came in within maybe 30 minutes of starting my sequence. I got pretty excited when I heard him coming (thinking it was an elk!). He came within 14 yds from me. I had a tag, but didn’t want to mess up my spot with gutting and breaking down a bear.