If it's a good deal, check it for function, etc (even better if you can test fire it). If it checks out, buy it.
I reload, so I'd also buy a set of dies so I didn't have to worry about ammo. If you're not interested in reloading, and don't have a friend that does it, you may end up selling it in the future if ammo gets scarce or they stop making it all together. But in the meantime you can enjoy a nice lever action rifle in a pretty nice deer cartridge.