I agree with edible favors- really easy to match to the theme of the shower (if you want) and people don't wind up with some trinket that ends up getting tossed.
This. I picked up a pretzel stick candy mold thing from Michaels in the shape of alphabet blocks that spell out "Baby" which I'll use to make chocolate-covered Twizzlers (not a fan of pretzels) then wrap up in special cellophane pouches.
With the mold, wrappers, and candy/chocolate, I'll be looking at spending about $1/guest. And I didn't want to somehow offend my shower hostesses by bringing along anything excessive as a favour gift for the attendees, so this also seemed to fit that bill too.