Can I add a product for a specific customer?

[lesaurus]

I am trying to set ZC up for the following scenario

I sell digital goods on auction sites.

When an auction is won I want to then send the winner an email directing him to the product on my ZenCart

I only enter the product price - or even the whole product - when i know if and how much they won the product for in the auction.

After following the link i sent them in the email, they arrive at the new products page, click on paypal button and then after payment get the download link.

I want to do it this way so that it is entered on to the ZC system as an order as i like to keep thing simple and in one place.

Points to note:
Obviously the product must only be available to the auction winner, I don't want a site visitor to be able to buy it. I know i could just set the product up as soon as i know it has been sold and then just send them the URL but it will show up in new/featured products and it is possible that some one else could try and buy it

It's basically an invoice for them to pay but set up as a product on ZC

Is there any way to achieve this? Hidden product / url, code or coupon that only allows them to buy, way to send an invoice that still puts them in the system?

Thanks Paul