This is it here:

+ YouTube Video

***EDIT... I just clicked on the link in the description to the video and the product appears to be discontinued... I'll try to look around for something comparable.

*** EDIT #2

This is probably the next best thing for the price of what is currently available that I can find 320W x 4 port @ $120 = 38¢/W
http://www.hobbypartz.com/73p-t6x4-charger.html

I've got a single port Thunder charger that is almost 7 years old and still going strong, I use it about 1-2 times a month to charge my cordless drills that have been converted from NiCd to LiPo

Another one to consider here to get full potential if you use a couple parallel boards to charge 2S on one port and 4S on the other port if you need to mix match classes, etc 400W x 2 port @ $110 = 28¢/W
http://viciousteknology.com/b6duo.html

Next step up is this 600W x 3 port @ $185 = 31¢/W
http://www.smc-racing.net/index.php?...product_id=458

Next step up again is this 1200W x 4 port @ $220 = 18¢/W
https://hobbyking.com/en_us/turbo-ch...version-2.html <-- note this one also supports charging LiHV cells too

Plenty of options, but also consider which power supply you need as well... I think a 600W combo is probably the sweet spot for reasonable pricing.