I live in a section of San Diego County that is a bit removed.  I have one neighbor and a lot of property.  Or I should say my mom does.  I hang out there when I don't have a dog-sitting gig, because it's just too damn expensive to live in San Diego...and my paycheck isn't big enough for a car payment AND rent.  So there you go.  Anyway, concequently, I haven't dealt with kids at Halloween in years.  That will change this Monday, because I am house-sitting in a very kid-friendly neighborhood, and I expect a lot of knocks on the door here.  My clients didn't leave any candy, and I could have just turned off the light and ignored the event, but I'm sort-of up for the challenge.  These clients left me extra cash anyway, so what the heck.  I don't want the poor kids to get yet another few pieces of the common Costco blend, so I wanted to find something a bit unique.  I headed to Walmart, where I figured I'd get the best value.  The irony is that I work at Costco, but that's beside the point.  Anyway, I'm pretty proud of what I came up with.  No digital camera, so I have no photos (yet), but check it out!  I figured I'd give the kids their choice between a toy or a treat.  
I got a package of 12 
plastic animals for 88 cents.  Cool, huh?  
Mini 
playdough at 10 for $4, so 40 cents a piece is acceptable.  
Packages of two 
glow in the dark bracelets, 44 cents each.  
And two packages of 
pencils (30 per) for $2 each.  Not too shabby.  
I bought pencils once upon a time when I lived with my boyfriend.  He was mortified until we had kids lined up outside, screaming, "they've got pencils here!".  Go figure.  I heard a dentist in the neighborhood gave out mini tubes of toothpaste and a mini brush, with similar results.  Like I said, it's all about something different.  Why have 25 Milky Ways, when you can have packages of cheese popcorn?  That's what I'm talkin' about!  
Anyway, for treats I got packages of 
Oreos (6 cookies packs, and 12 per box) for $4.  
Ditto with boxes of 
Cheez-its and Keebler cookies. 
I figure if I have left over snacks, it's something I myself would want in my lunch.  I thought about individually wrapped Ding-Dong cakes, but I thought they might mush.  
Then I went to Costco, and they were out of cheese popcorn, so I got a 36 count box of 
chocolate chip cookies.Pretty darned decent though (I hope the kids agree).
other ideas: bubble liquid, cheap jewelry (bangles, rings, etc), stuff from the craft store like letter beads in little packages (my rule is under 50 cents). Stuff from the party supply store-like favors that are toys and weird goodies.  I got candy necklaces.  They had pixie-stix.  Packages of rice crisy bars, snack-size chips, packages of stickers. Art supplies like small boxes of crayons or paints. Funky band-aids?  I'm reaching now.