How much does a battery and charger cost and what amperage's are available??

You can find compatible (Milwaukee M12) batteries using the link below.https://www.toolnut.com/power-tools/cordless-tools/batteries-chargers/batteries.html?manufacturer=Milwaukee&tn_battery_voltage=12+VAnd, compatible chargers:https://www.toolnut.com/power-tools/cordless-tools/batteries-chargers/chargers.html?manufacturer=Milwaukee&tn_battery_voltage=12+V