expressions - Different meanings for phrase "off the regular price"


What is the correct way to say a product can be bought with a discount of 30%?


Is it: “Buy this by 30% off the regular price.”?


What I want to say is that a 30% discount is being given, so the product will cost 70% of the regular price.


There seems to be a difference between of and off. Will this wording be misunderstood to mean that the product can be bought by 30% of the regular price instead of 30% “off” the regular price?


How do I say it correctly and without creating doubt?




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