It depends on the complexity you are looking for. For example, do you need an interface to set a different price on each item? Can you have a single price for everything that is configured in web.config (and thus doesn't need a UI)? Does a user's shopping cart need to persist across sessions?

I assume you referring to photos that are protected with a watermark before purchase and no watermark after purchase. That is pretty each to accomplish but things get more complex if you are talking about videos and other objects that aren't capable of getting a watermark.

The simplest e-commerce scenario might look like this:

* One price for everything. Each media object has a link that takes you to PayPal to purchase it. You can only buy one item at a time. This would be very easy and only take a few hours (maybe even less than an hour).

But it sounds like you need a shopping cart where users need to accumulate their items. It might have this functionality:

* One price for everything. Each media object has an "Add to cart" link. The user's cart is stored in session. The checkout page lets users delete items but not adjust quantities. It has a button that that sends the user to PayPal with the amount that must be paid. After paying the user is redirected to a custom album containing their purchased images with watermarking disabled. Applies only to images.

This might take 40 hours or so to implement. Since it could be useful to others, I'll offer a 50% discount, so my rate is $40 instead of $80. That gives a cost estimate of about $1600.

If you need additional functionality, the cost goes up accordingly.

If you are interested, contact me on the support page and we'll go from there.