Hi Joe,
Yes, s2Member supports the Buy Now sale of Specific Posts/Pages via PayPal® Standard Buttons:
s2Member Supports the Buy Now sale of Specific Posts/Pages via PayPal® Standard Buttons. Membership registration not required by customer. This is an added layer of functionality, very powerful. You can even package multiple Posts/Pages together into one “Buy Now” transaction. Specific Post/Page Access, is like selling a product. Only, instead of shipping anything to the Customer, you just give them access to a specific Post/Page on your site; one that you created in WordPress®. A Specific Post/Page that is protected by s2Member, might contain a download link for your eBook, access to file & music downloads, access to support services, and the list goes on and on. The possibilities with this are endless; as long as your digital product can be delivered through access to a WordPress® Post/Page. For instance, you might sell an existing Member an additional item (without affecting their current Membership plan).
Please see Features » PayPal® Standard Button Integration for more details.
s2Member also supports file downloads: