(WSJ) - Retail giants including Target Corp. and Wal-Mart Stores Inc. are again betting consumers will skip a second slice of pumpkin pie to shop Thanksgiving evening.

This year, they will be challenged by a host of startups, plus e-commerce titan Amazon.com Inc., offering to deliver a last-minute bottle of wine, a bag of stuffing mix or a DVD, in an hour or less.

Startups vying to ensure that consumers leave home as infrequently as possible don’t want to miss out on the U.S.’s most gluttonous holiday. Amazon is joining the party, offering its Prime Now one-hour delivery service on Thanksgiving in nearly two dozen metropolitan areas.

The competition to keep Americans sated and gifted can disrupt workers on the nation’s most commonly observed workplace holiday. The Society for Human Resource Management says 94% of employers give workers time off on Thanksgiving, more than Christmas or any other day.

Many of the delivery services classify their workers as contractors rather than employees. They are relying on the prospect of bigger paydays to lure them into working on Thursday.