This is the one that I am using.
I purchased it from this website. The exact model I got was the 011-JSX100X (1540 gr Scale) for $32. I have checked it against my Lee Scale multiple times, and it has always been right on. In addition, I check it against RCBS Check Weights before each reloading session, and it always right on.
It is the same one that BrianEnos sells for half the price.