Optima's, when they had a 7yr warranty, were worth a price premium. With just 36mo, like anyone else these days, there are much better options out there including AGM. And just b/c they have a battery which fits doesn't mean a deep cycle is the best choice for your application (maybe if you leave it parked at the airport for months on end...).
Anyhow, a tip:
Clear your browser cookie history (or open a private tab) and hit your local AutoZone, Advance, O'Reilly's or what have you. In most cases you'll immediately get a pop-up offer for 15-25% off anything ordered online for pick up in store.
Good luck
