That'll dependent on manufacturer, your location, general availability, and demand. The .380 cartridges are in a bit of a shortage state in the US at the moment, and this has driven prices up. Generally, $25 - $35 for a box of 50 seems to be the norm, with specialty loads going higher.
You can only use .380 ACP ammo in a .380 pistol. Period.
New, about $380 New, about $380
The Airbus cost over $500,000,000
Which model?
Yes- you use the ammunition that is marked on the firearm.
Many makers offer firearms that shoot the 380 ACP.
it depends on how much they cost
380 (silver) Fish
r5 bulttet
a round 28-35 dallors
Depends on which 9mm you are refering to
50-150 USD.