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?