Not sure if this is a rant, too-much-info, or a very complete answer. I do that sometimes.
The 'real' T-105s are Trojan-brand 6V 220AH. I heard yesterday the 'big' local dealer is getting ~$140 each.
The Sam's golf cart ("generic T-105s"?) are rated a little less, like 190~210AH(?), but the Sam's batteries used to roll off the same line, with the same parts. (Google trojan battery recall) Not sure about now, but I'll check the terminal stamp codes on some about 2 weeks old when I can.
I don't care about the warranty...
Part #1. I don't care about the warranty, as long as it is 100% for 6 months.
Good batteries don't need a warranty longer than that. I probably put in somewhere around the tripple digit mark of "T-105s" in the last 6~8 years, mostly Sam's Club, and I am ~not aware of~ any being replaced. Many of those were in small systems that went through a G27 once a year (note).
Part #2. I don't care about the warranty, because some big name-brand battery company won't honor the warranty without more time, effort and money than it costs to just buy another battery. Most of the small dealers around here have gone to Interstate because of that (though there are some other issues with the area's distributor).
Does anyone think they can prove they have not violated the warranty exculsions of Trojan? It does need proved.
http://www.trojan-battery.com/Tech-Support/SolarWarranty.aspx
I returned 2 car batteries (and seemingly countless tires) to Sam's. No problem with any warranty stuff. And 'a battery is a battery', so they take a 1.3AH SLA for trade-in on a 6V.
Part #3. I don't care about the warranty, because my truck had a crappy warranty, and in 170K miles it only needed an O2 sensor (out of warranty, BTW). It's rusty, but I still drive it. (I don't count shocks, tires, oil changes... or gas)
My neighbor's car had a Great warranty, and it needed a new motor, couple starters/alternators, 2 complete A/C systems, and 3 transmissions... all under warranty. It was shiny, but he traded it in before the warranty expired!
(note) Pay $120 for 2, 12V 115AH, or $125 for 2, 6V 220AH. Sounds the same. In a reliable system that is being used, the 6V will be cheaper before long.
YMMV,
G-