There's a pile of sand mullers on eBay right now if anyone is in the market. Not associated with any of them, but I figured I'd throw this up as there's suddenly a nice selection right now, some at decent prices

3 Mini Mite M2 mullers:

https://www.ebay.com/itm/Kroeger-Min...r/172996875816

https://www.ebay.com/itm/Sand-muller...r/142602454271

https://www.ebay.com/itm/Mini-Mite-M...r/122814651791

McEnglvan Swif-mul:

https://www.ebay.com/itm/McEnglevan-...y/282734130783

Simpson mix-muller:

https://www.ebay.com/itm/Muller-Simp...r/122734107048