Need some Alberta, Ca insight asap

Currently in Jasper with a new to us 2008 Keystone 5th wheel. Still have another 10 days here and just tried to refill one of my 30lb propane tanks, but was told it can’t be done unless recertified, or replaced. My bad for not remembering that tidbit of info. So,, is there anywhere close to either Jasper or Banff where I could get replacement tanks??
I’m searching the internet to no avail.

Thanks for any assistance!!