Osage County Guns has them on sale for the next ~12 days:
https://www.osagecountyguns.com/firearm-accessories/magazines/sig-sauer-mag-365-9-12.html
$34.99 or less then $40 shipped when choosing First Class Mail - Fixed as the shipping option.
https://www.osagecountyguns.com/firearm-accessories/magazines/sig-sauer-mag-365-9-12.html
$34.99 or less then $40 shipped when choosing First Class Mail - Fixed as the shipping option.