Free: Contests & Raffles.
All year....makes a good excuse to go for a hike to see what is up. Also...if there is a little snow on the ground you can learn a bit more about travel routes.
For just scent I've heard of guys using vanilla. That's for whitetail deer but I don't see why it wouldn't work for all species, and elk too. I just haven't got around to trying it. Another one that's supposed to work really well is grape kool aid. Again, I have not tried it yet, but probably will this spring/summer.
Be carefull with the scents and stuff....anything you put out could be labeled as baiting for bear. A little pack of cool aid powder and boo boo will smell it from a ways away. Same with salt and of course the apples...they love 'em.
Good question with no set answer. We have had threads that debate it in the past. Only thing I can tell you is the areas I've had cams and baited I've waited 30 days from when the bait/feed/scent/salt was consumed or otherwise gone before hunting the general area for bear.
C-post anyone?