Two types of prices can be indicated in the Product feed: the regular price of the product and the current reduced price. This information can be identified using Schema.org microdata or Open Graph.
An example of Schema.org markup using the priceSpecification element:
The Best Product Name
1000.00USD
900.00USD
(Offer valid until 2029-01-12)
An example of Open Graph markup using the sale_price element: