Precious metals keeps driving up cost of batteries and other metal-based objects. We purchased a couple Trojan AGM batteries in January. Upon deciding to purchase two more, the price was $30 higher a few weeks ago. That is a substantial price increase. The price of a 10 foot long battery cable to run to the new bank was much higher as well. The cable was as much or more than many batteries cost nowadays.
Speculation says that it's because of the civil war in Iraq. That has caused a skyrocketing increase in the cost of ammunition and related metals.
Some things to keep in mind if you planning a purchase. The sooner the better.