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There are several 9mm cartridges which makes the designation somewhat confusing. When someone simply says "9mm," said person is usually referring to 9x19 also known as 9mm Luger, 9mm Parabellum, and 9mm NATO.
.380 Auto is also known by several different names depending on the country of manufacture including .380 ACP, 9x17 Browning, 9mm Short, 9mm Corto, and 9mm Kurz.
Other than the diameter of their bullets, 9x19 and .380 Auto have very little in common and they are not interchangeable. Besides its 2mm shorter case, the .380 also uses a straight-walled case as opposed to the 9x19's tapered case. The .380 also is much lower pressure with a SAAMI maximum of 21,000 psi as opposed to the 9x19's 35,000 psi max. .380 Auto typically uses light bullets of 95gr or less while 9x19 is commonly loaded with bullets of 115-147gr. Finally, .380 is usually found in smaller blowback-operated "pocket pistols" like the Colt M1908, Walther PPK, Beretta M1934, and Sig P232 while the 9x19 is usually found in larger "service pistols" like the P08 Luger, Walther P38, Browning GP-35 "Hi Power", Beretta M92, and Glock 17.
As has been mentioned, your CZ-24 is chambered for .380 Auto and not 9x19. I don't know how ammo availability is in Canada, but in the United States .380 Auto is a very common and popular cartridge that can be found in most small gun shops as well as larger retailers like Wal-Mart, Gander Mountain, Cabelas, Bass Pro Shops, and online retailers like Midway, Natchez Shooters' Supply, and Graf & Sons. .380 Auto ammunition is loaded by nearly every major ammunition manufacturer including CCI/Speer, Federal, Remington, Hornady, Winchester, Fiocchi, Sellier & Belloit, Magtech, Prvi Partizan, and Geco.
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