Yeah, you have to Google it and then they have it as part of their 881/2/3/4 family. The range is where they differ, the 871 is 0-85% Brix whereas the 884 is 0-50% Brix. Resolution and Accuracy are identical. Keep in mind that 50% Brix is 25% alcohol v/v so the added range of the 871 really buys nothing for beer brewing.
Just checked Amazon and it's currently $79.99 with free Prime shipping.
Thanks for the info. Been thinking about one of these for a while. May pull the trigger this summer.