If you want an AGM, like the blue top, catch up with a guy in a battery distributor truck. Had one offer me a couple of those for about $60 each. They had a broken stud or something that made em a second but they were new enough and well worth the money. Might have a couple of turn backs from a parts store that are out of date but never used. If the stud is broken you could get a terminal that utilized the post instead of the stud and has a stud on the terminal. Food for thought.