Create one product from several?

We will be selling lectures in an mp3 format on our site. Some of these lectures are a series of 4-12 items. Can we build a product item containing all the series files so that the price is different than buying each lecture file separately?

If not does anyone know of a shopping cart that does?

Why not just simply make a new product which has all the files combined, at the cheaper price.

File size would be prohibitive. Smallest single file is 58 mb. Good suggestion though.

So I take it this is not a possibility in Zen-cart?

Thats not really a Zencart specific issue - If a customer needs to download 12 files, and they are at least 50mb each - then no matter what cart you use, you still have that issue.

Have you made sure the MP3s are compressed? Seeing as they are speech, have you chosen a medium sample rate, and maybe even considered putting them in mono.