The Costco around here has group 48, but not group 41. Battery is $58.

Does costco still carry a group 41/91? What about walmart? I'd like
to buy 2 and keep it under $100 if possible. Walmart is quite a drive
for us otherwise I would do my own research of course.

Group 48 is a smaller battery and it is also cheaper, yes?

I live in NYC and the weather here seems fairly kind to batteries.
I'm going with dual batteries so I don't accidently kill the starting
battery from lights and sound.

Thanks for your input.