Struggle finding a cart plugin.

I am working on a photo gallery that will reside on my companies intranet. Searching wp plugins had produced mixed results. I’m a meager coder and our web dev guy isn’t that versed in WordPress.

We need a cart that allows:

• Add to cart
• Batch download
• form/cart-to-email (for print orders)
• Doesn’t rely on third-party service
• can accept free or $0 function

This is in-house only so security and a mass of store-like options isn’t necessary. The most important need is a way to give the user the ability to pick out several images to download for free or order prints, all the while not having to remember the image names and put them in a contact form.

Edit: I currently am using NextGen Gallery if that helps.

Thanks for any advice!