It might be a bug or something in the data base left over that is causing the SLA batteries to be charged a high shipping fee. There should be no extra shipping fee when adding these to a kit as it is included in the battery price so I can use priority mail (fixed rate). The glitch causes the discount to subtract a large amount, more than the shipping cost. I know people love free shipping so I will fix the issue as soon as possible. A typical motor kit weighs about 20 lbs, so the shipping is $20 to the western states and increases to $35 to $40 on the east coast. So once I get it working again, people back east will get a good deal on the kits. This is not a promotion, we actually have more orders than we do motors right now and are having to ration them. The free shipping was only for readers of this forum, as a small contribution to the cause.