FiiO X5 2nd Gen Stacking Kit (HS16) for $6.69

Accessorize time for the second generation Fiio X5 DAP. It’s official Fiio HS16 stacking kit is on sale for $6.69 by a marketplace seller with the order fulfilled by Amazon, so it is Prime eligible. They either have 15 units available at this price, or the limit is 15 per customer. The former is more likely. The other sellers there have it for $15.