6. Join Walmart's Receipt Survey Contest

Walmart's survey sweepstakes offer $100 to $1,000 gift cards. Enter by making a purchase for a receipt invite, getting an email invite, or mailing a request. Complete the survey within a week and it takes under five minutes. No purchase is needed for mail-in entries. Odds of winning depend on entries. Open quarterly to U.S. residents, including D.C. and Puerto Rico. Must be 18+ to enter, except in Alabama(19), Nebraska(19), and Mississippi(21).