“When better than Christmas to make a point about hyper-consumerism?” asked Mr. Jennings, 37, whose action figure comes with tiny accessories including a gas mask, bolt cutter, and two Molotov cocktails, and looks convincingly like any other doll on most toy-store shelves. Putting it in stores and filming people as they try to buy it as they interact with store clerks, Mr. Jennings said he hoped to show that even radical ideology gets commercialized. He said for safety reasons he retrieves the figures before customers take them home.

Jason Brody, lead singer for an independent pop-rock band in the East Village, said his group recently altered its shopdropping tactics to cater to the holiday rush.

Normally the band, the Death of Jason Brody, slips promotional CD singles between the pages of The Village Voice newspaper and into the racks at large music stores. But lately, band members have been slipping into department stores and putting stickers with logos for trendy designers like Diesel, John Varvatos and 7 for All Mankind on their CDs, which they then slip into the pockets of designer jeans or place on counters.

Image At a Whole Foods in New York, Ryan Watkins-Hughes stocked a shelf with cans carrying art-infused labels. Credit... James Estrin/The New York Times

“Bloomingdale’s and 7 for All Mankind present the Death of Jason Brody, our pick for New York band to watch in 2008,” read a sticker on one of the CDs placed near a register at Bloomingdales. “As thanks for trying us on, we’re giving you this special holiday gift.” Bloomingdales and 7 for All Mankind declined to comment.

For pet store owners, the holidays usher in a form of shopdropping with a touch of buyer’s remorse. What seemed like a cute gift idea at the time can end up being dumped back at a store, left discretely to roam the aisles.

“After Easter, there’s a wave of bunnies; after Halloween, it’s black cats; after Christmas, it’s puppies,” said Don Cowan, a spokesman for the store chain Petco, which in the month after each of those holidays sees 100 to 150 pets abandoned in its aisles or left after hours in cages in front of stores. Snakes have been left in crates, mice and hamsters surreptitiously dropped in dry aquariums, even a donkey left behind after a store’s annual pet talent show, Mr. Cowan said.