The Deka brand batteries can be found for around $99.00 on the most notorious online shopping sites. I thought I'd give a $70 Powerstar a shot. Seems to work fine in my 2010 FLHTC!
My first two Harley batteries worked great. However Walmarts battery has worked fine in my Softail and is gel mat just like the Harley ones that came out. Make sure it's AGM jell mat. $80 . You do have to activate it and charge it overnight.
Most places like Batterymart are out of the Deka etx30L batteries and had a 2-3 week lead time. If you want to pay more you can find one. I found one at etx30L.com. $109 to my door, should be here tomorrow. I mean Monday.