How to save apple apps to install on personal iPhone after a while?

I've heard of some apple apps that soon will be removed from apple store. I don't yet own an apple machine (ipad, iphone). In about 2 months I will have my own iPhone. How can I save apps and install them later?

You can't save apps before you even have the device, it doesn't work like that.

Could buy them anytime you want & install them when you do get an iOS device.