June 15, 2014 10:48 AM EDT

Costco is apparently the new place to be to rub elbows with the nation’s political elite.

While browsing at the members-only retailer in Arlington, Va., on Saturday, Supreme Court Justice Sonia Sotomayor stumbled upon former Secretary of State Hillary Clinton, who was appearing at a book-signing event to promote her new memoir, Hard Choices.

Sotomayor, who said she was “just shopping,” promised Clinton that she would read the new book, to which Clinton said, “You better! I read yours!” according to tweets from observers.

Government leaders, they’re just like us — they buy in bulk.

Write to Nolan Feeney at nolan.feeney@time.com.

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