Try calling a few Trojan dealers around you for 8D AGM's - use a co. name and maybe you can get a wholesale price - just a few amp hrs. less than Lifeline - HTH
I did call the local Trojan dealer and when I asked about 8D AGMs never brought up Trojan. Instead, he recommended a East Penn Deka 8D for $440.
My employer buys a lot of batteries from this dealer, but it doesn't appear they will extend me my employer's price. I called from work and the dealer saw the caller ID and assumed I was placing an order on behalf of my employer. If I get serious about buying the batteries I'll ask them for a discount.