Through Sunday 6/18/23 SAR USA has some pretty good deals. Almost everything on sale. Magazines are 50% off and ammo is 25% off. Besides SIG and Winchester, they're one of the few manufacturers of NATO-spec 9mm ammo. A case is only $217.49 but they make up for it with a high shipping charge, however they don't charge tax so the shipped price on a case is $274.99. If you're looking for 9mm NATO that's about the cheapest you're going to find it.
https://sarusa.com/product-category/ammunition/