physics - 5:40 pm on Jun 25, 2007 (gmt 0)

A point I forgot to make is that unconditional free shipping doesn't encourage a large order size.

Right, look at Amazon. I'm sure shipping costs for them are MUCH less than for any of us because of their distribution network. And they require at least a $25 order. Offering free shipping on an item that costs $7 is a monumentally bad idea ;)