Most of these sites support payment through an intermediary such as BitPay.
Generally I can recommend you these sites:

• bitify:World's largest Bitcoin marketplace and auction site. Buy online with Bitcoin securely using our secured escrow service with up to 30 days buyer protection.[1]
• gyft:you can easily upload, buy, and redeem gift cards in stores or online. [1]

You can also use this menu https://greycoder.com/list-companies-accept-bitcoin/

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Souces:
#1 https://bitify.com/
#2 https://www.gyft.com