I seriously doubt you'd find them at $50 a box anymore. They are strictly a collector's item.
BUT the good news is the rifle can be converted to a centerfire and the company that does it sells the cases, bullets ,dies and all the load data for it.
If you decide you're not interested how about PM'ing me the info on who has the gun with contact info. I loved mine and sure wish I'd not let it go when ammo got impossible to find. Back then there was no other ammo option available, now there is.