In the end, I got two regular valve tanks that were already filled. I saved $15-20 from buying a filled tank from Amerigas, so not exactly a huge bargain. One tank is 2015, the other 2010. I thought they're good for 12 years, so I'll run the 2010 out first, and swap it. The 2015 is really clean, so will refill that one and keep it.
Interesting looking in the Amerigas cages at the local store, as most I could see are 2000-2010 and have been re-certed and have some paint covering up the rust. Previously, I'd had older bottles and kept swapping until I had a 2015 and 2018, but then sold/gave away those before we moved, as I didnt want to deal with propane bottles in a POD of carrying them 700 miles in my car.
Thanks.