There are many sources of 10mm ammo for sale, but there is one brand you should know. Remington UMC ammo has been the standard in 10 mm range ammo for decades, and they are currently producing it in bulk. Theirammunition features nickel-plated large-primer cases and a bronze-coloredfull-metal jacket bullet. They are also inexpensive, making them an excellent
choice for hunters who need a reliable backup ammo load.

https://gunsarms.com/

10mm is a great caliber and availability varies widely by your location. I wouldn't worry too much about this current t ammo craze and try to draw "normal times" comparisons based on what you're seeing now. I believe all the major calibers will be back and available most places by summer and fall 2021 or so.
https://www.westpennpower.us/