What is the cost of Winchester White Box 44 Mag 240 gr these days? The last time I bought factory 44 mag ammo was from Wholesale Sports when they were still open, about $50 for a box of 50 rounds. Checking out a few websites, this stuff goes for $80 - +$100 now? Ouch.
As others have mentioned, shooting 44 magnum is a perfect reason to start reloading, even if you ever only reload 44 mag. You could pick up a basic Lee kit for less than $300, add dies and your components, and you're ready to get started.
Why reload 44 mag? As you've noticed, cost and availability sucks right now. Reloading components aren't easy to find either these days, but you have a lot more options. Flexibility is the best reason to load 44 mag. With factory ammo, your only choice is "full power". When you reload, you can load powder-puff loads that even kids can have fun shooting. Or mid-power loads, so you can shoot more at your range session without developing a flinch or getting blisters on your hands. Or full power loads for $hi+s and giggles.
Reloading is also a really fun hobby, it's easy to do once a person learns the basics, and there is a ton of info out there on the process. If you shoot your 44 a lot, the investment in your initial reloading tools will offset the cost of factory ammo pretty quickly.