Traditional Culture Encyclopedia - Tourist attractions - How to gracefully refuse when a tour guide sells products?

How to gracefully refuse when a tour guide sells products?

When traveling, I met a tour guide to promote a product. If I say this product is my favorite, I can buy it even if the price is relatively expensive. If I don't like this product very much, I can just refuse him and tell him not to buy it. I should tell him politely. After all, we should respect his profession. I can say I'm sorry, but I have something like this at home. Thank you!