Can, Case, Whatever has the best discount
I've been buying my ammo mail order (Internet now) for over 20 years.
These last few years, the prices have really gotten ridiculous.
For a while it was cheaper to get handgun ammo at Walmart if you could find it.
Now, even their prices have skyrocketed.
Not even the milsurp is much of a deal if you can find them.
Ammo but the can/case doesn't seem to save that much especially after shipping.
However, they are a heck of a lot cheaper than buying from gun shops.
Seems like a lot of imports are being held up and US MilSurp being destroyed instead of selling to the public.