Bought my 1st stackable slab holder from Whitman Publishing (with along with my 1st graded V nickel pictured on eBay) which all came in this week, given how much I have in my eBay cart, it's going to fill up fast (Also have a '43-S MS65 Steelie on the way) Can't really get the tone on the Jeff nickel pictured but it has a really cool bluish tone to it.
Shop for a pre-owned safe in your area. Let me know if you find an extra one in Arizona I'm in need of another myself.
Btw for anyone interested they have the slab storage boxes on amazon, I'm about to buy this one: https://a.co/d/3nZbn6U