I've started working on a Free Product module, but I'm hitting a snag that I don't know how to get past. If I setup Flat Rate shipping, $1.00 per product and I add 2 paid products and 1 free product to my cart....I don't see how I can avoid hacking core Ubercart and manage to get a Flat Rate shipping quote that does not count the free product when creating the quote.

If there is no way to handle that, then the Free Product module would need to restrict the cart to containing all free products or all priced products before proceeding to checkout...and I'm not sure how useful that would be. This is assuming that a reference to a "free" product means that there should be no shipping or tax charged, and also that there should be no payment information required when a customer wants only to purchase a free product.

Also note, this is different than a $0 checkout module. That module would ideally allow for someone to make a $10.00 purchase with $1.00 tax, $4.00 shipping, and a $15.00 gift certificate and then not have to enter any payment information because the order total would be $0.00. That is a different issue, but would work in compliment to the Free Product module.

Any ideas?