[Programmatic]

I think the solution would be to create a system where:

1) we have a minimum amount to hit before the marginal shipping cost is $0,

2) build the shipping cost into our margins, and

3) advertise that the marginal cost is $0.

[Jemmeh]

So basically Amazon's free shipping deal. Prime items if you're not a prime member over a certain $ amount gets free shipping.

[Programmatic]

;)