Tony Chavez and his wife, Elizabeth, came to Cardenas Market in East Las Vegas on Saturday to pick up a few essentials — bread, three dozen eggs and ingredients for tamales.

Mr. Chavez did not expect to check something else off his list. But when he saw poll workers and signs saying that he could vote, well, why not?

“I already made my decision, and it’s better to be early to beat that line as well,” said Mr. Chavez, 38, with a prominent “I Voted” sticker on his all-black Las Vegas Raiders letterman jacket.

“I saw the signs and was like, ‘Is that the voting?’” he added. “‘Let me just do it right now.’”

Mr. Chavez, who works as a cook, was part of a steady stream of people who took advantage of that particular polling location in Las Vegas on what was the first day of in-person early voting in Nevada, which runs through Nov. 1.

He declined to say whom he was supporting for president, but he said that rights for migrants and for women were important to him and that this choice “would affect my kids’ future.”

Another voter, James Still, also marveled at the convenience. His wife, Jennifer, wore a shirt supporting Vice President Kamala Harris, and Mr. Still said they had both voted for her because “politicians shouldn’t tell women what to do with their bodies.” For them, as for Mr. Chavez, voting was an added benefit of coming to the store.

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