What vendors offer free shipping all the time??
The cheapest min amount ($30) that qualifies for free shipping that I've found is GoodProphets.
Are we talking juice or hardware?
If hardware what kind?
The reason I ask is some vendors hardware is cheaper than others so free shipping may not matter if the hardware is way cheaper than the others!
Right there is the "catch", so to speak. From the sites I've looked at, it seems the ones with "cheap" shipping have slightly higher price on their goods (hardware, juice, etc), and sites with higher shipping seem to offer lower prices on the goods.