On storage; i think any container than minimizes air movement around the coin is good. I personally keep my coins in Numis tubes for generic rounds and a capsule box I bought on amazon for my Morgans.

41mm Coin Capsules, with Foam Gasket and Plastic Storage Box, for Coin Collection https://www.amazon.com/dp/B08133PNQ1/ref=cm_sw_r_cp_api_glt_fabc_G2E6ANAK4J3T1HTKWFQG?_encoding=UTF8&psc=1

I’ve never paid spot at my LCS; usually 19 to 21 time face for 90%. $28 for Morgans/peace.