Kay's Technology via Amazon offers its KaysCase ArmorHolster Heavy-Duty Case with Holster for Apple iPhone 6 in Black for $8.48. Coupon code "KAYSI66O" cuts it to $2.49. Plus, coupon code "KAYSI6FS" bags free shipping. That's $23 off and the lowest total price we could. (It's also a very low price for a holster case in general.) It features a hard-back case that slides into a locking belt clip swivel holster.

Kay's Technology via Amazon also offers it for the iPhone 6 Plus in Black or Blue for $3.99 with free shipping via the coupon codes above. That's $22 off and the lowest total price we could find.