well Maxamps.com keeps up with every dime that you spend with them. So after you spend $100, you save 5% on every order, $250, you save 10%, and so one. I'm up to 15%, and it's amazing how much money I've been saving. It usually saves me at least $10 on each battery pack, and it adds up quick. I've probably saved $300 just with that rewards program. The guys at maxamps.com are really good to deal with.
Here's an example of their excellent customer service if you want to read it.
One time when I ordered some packs, I had to have them for a competition that was coming up in a week. I needed a special size that they were able to build to fit just right on my crawler and put the weight just like I wanted it. They were out of those cells, so it said on their site that if I ordered them I would have a 2 week wait. I emailed Jason and asked him if he knew anywhere else that I could get them because I was in a bind to get them before the competition. He sent me an email in about 5 minutes and said that he might be able to help me. In about 15 minutes, I got another email. One of the employees had pulled some of the cells out of their inventory and bought them for his personal stuff. He hadn't used the cells, so Jason sent me the email letting me know about the guy buying the cells for his personal stuff. He told me to order the batteries like normal, and he would get them and have the batteries built in a few days and mail them to me. I told him how much I appreciated it and went on about my business. I was at work, so I was going to wait until I got home to place the order on their site and pay for them. About 4 hours later, I got an email from UPS that I had a package being shipped to me. I thought it had to be a mistake since I hadn't even paid yet. I emailed Jason, and he said it was no mistake. He knew how bad I needed them, so he had the guys in the shop build them immdiately and went ahead and shipped them, BEFORE I had even paid, because he wanted me to have them in planty of time. That's the kind of customer serive that you don't get at most places.