If only paying more meant one was assured of getting a better or genuine instance of a module. 
I accidentally purchased 25 RTCs, thought I was buying 5 (life tim supply) but turned out to be 5 packs of 5… so they are the ones I’m using, haha.
So far so good, but I have not checked the long term accuracy, one specification that the counterfeit modules can’t keep up to.
a7