See our Product webmaster docs for full explanation of the Offer-aggregate type, and how to encode Product data in RDFa, microformats or microdata. This page exists to contain a machine-readable microdata description of the Offer-aggregate type itself (at the URI http://data-vocabulary.org/Offer-aggregate).
An item with the item type http://data-vocabulary.org/Offer-aggregate represents an aggregate offer. The following are the type's defined property names

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Property	Description
lowPrice	The lowest price of all offers available. Floating point number.
highPrice	The highest price of all offers available. Floating point number.
currency	The currency used to describe the product price, in three-letter ISO format.
offerCount	The number of offers for the product.
condition	Any text may be specified. If the condition attribute is used, the value of the content attribute must be one of the following recognized values: new, used or refurbished
availability	Any text may be specified, but the value of the content attribute must be one of the following recognized values: out_of_stock, in_stock, instore_only, or preorder
offerURL	A URL to the product web page (that includes the Offer). (Don't use offerURL for markup that appears on the product page itself.)
identifier	The product identifier. Google recommends including brand and at least one identifier for each product. Recognized types include: asin, isbn, mpn, upc, or sku
itemOffered	The item being sold. Typically, this includes a nested Product, but it can also contain other item types or free text.