I believe if you can get one from Walmart or NAPA on sale then it might be worth it. But paying over $300 for an Odyssey or Northstar or spiral wound does not seem to make financial sense to me at least.
You may have to hunt around on Walmart website to find them. Not every Walmart has them Unsure of your size also.
Most newer car charging systems are flexible enough to handle a normal AGM battery. You can also email East Penn an ask them. They will respond in a day or two.