I just bought 600 Panasonic NCR18650B cells from 18650batterystore.com
Ordering was pretty easy.
I'm in Colorado USA and shipping from GA was $52.
Prices for the cells was better than the Chinese seller I've been using for the past 2 or 3 years.
The box arrived on time and everything was well packaged.
I got my order yesterday. I am currently short 240 cells! I emailed them last night right after counting everything twice. It was just some packaging mistake on their end and they just told me the rest are shipping today.
"We are sending another box with the remaining 240 cells, I will have the tracking info for you shortly."
Mistakes get made, as long as the seller responds quickly to get things resolved, I'm not concerned...and they did. No real complaints so far.
I opened the box and found 2 smaller boxes inside.
Inside each of these is 6 small boxes with 30 cells each in them. That comes out to 360 cells.
Right now I have every 18650 battery holder I've ever made packed with cells to charge them to 4.1v on 3 RC chargers. This is 104 cells charging at the same time. Once they are all charged, I'll start capacity testing them on my iCharger 4010 DUO which can test 20 cells simultaneously. If there is a problem with any of the cells, I'll know soon enough.