I totally understand. I purchased a battery for my 4 wheeler at Napa this summer and it was a little over $100. Hard to believe a ATV battery is more expensive than a car/truck battery.
The $125 would be bad enough if it would last 5-6 years like a car battery. Near as I can figure I have bought at least 6 so far for our two 4-wheelers, a 2oo1 and 2003 Honda. The model I buy are not that much, like $75.