product schema forces to use “offer” option.

Hello, I am using “product schema” for showing rich snippets for “editor reviews for products”. But using it gives an error on google. I don’t want to fill “offer” options but leaving it blank doesn’t work either (google rich results shows- Either “price” or “priceSpecification” should be specified). secondly even if I fill the price (in a range such as 9000-10000 or 9000 to 10000) it again shows error on google rich results (Invalid floating point number in property “price”).
It means whatever I do, using product schema from you would show error on google rich results.