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Amazon vendors doubled prices last year on 136 products considered essential for consumers, health providers and small businesses during the coronavirus pandemic, according to a new report.

The U.S. Public Interest Research Group Education Fund report released Thursday analyzed of 750 “essential supplies” such as toilet paper, pulse oximeters and hand sanitizers sold over the online retail site from Dec. 1, 2019 through Dec. 1, 2020.

Sellers of 409 products raised prices more than 20% over the past year. Another 136 items doubled in price, according to the report.

U.S. PIRG officials acknowledge can be inevitable when demand spikes but said states should enact or enforce price-gouging laws and the should take aggressive steps to protect consumers.

“Amazon has done a lot to combat price gouging on their site,” said Grace Brombach, a U.S. PIRG Education Fund consumer watchdog associate who