Sure, that is cheaper (Joybuy has always been cheaper, when they were in stock, almost bought it from there myself until I had a friend actually going to china pick one up for me in person). But that is the 16GB china-only version (ZX300A, like in this Drop), I was replying to the OP who claimed this drop was $100 more than the higher storage US/EU 64GB version (ZX300). That's actually the cheapest I’ve seen it on Joybuy in a long time... I wonder if it is to offset tariffs and maybe higher customs fees.
And yes, since this site became popular (prior to the name change), they became under more scrutiny from manufacturers and other dealers. Feel free to make your own assumptions ”why, ” but Drop’s prices are now usually on par with the average market price instead of undercutting it. It's the trade-off they made to be able to do manufacturer collaborations and be able to get some goods in consistent supply, have faster shipping times.
Wether you keep shopping at Drop or not is up to you. I never just shop at one store, but I keep finding reasons to come back here from time to time.