Use virtual credit cards
If your credit card issuer supports it, use virtual credit cards. I have credit cards from Bank of America and Citigroup that allow me to create a new credit card number for each merchant, set the credit limit, a shorter term (2 months), and the virtual credit card can only be used at the original merchant. I'm not a big fan of either of these banks, but my credit union's credit card doesn't have this feature, so I never use it for online purchases.
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