Alibaba is the site I've seen with the lowest prices. It appears that ShenZhen uses them for direct shipping. Kinda like an international eBay without the auctions. I have yet to use Alibaba so I can't vouch for them but they appear to be legit. If you have any doubt, contact ShenZhen to make sure.
Don't worry I did personal shopping for a multi-millionaire who expected me to find anything he wanted, anytime, for the lowest price. I can help you.
I'm having problems getting a link on Alibaba because their website is set up to hide the option, but here are some screenshot examples...
Heres the old model I purchased this year on Amazon...
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Here's the new digital model that now has temp sensors, timers, and power consumption readouts. It's $100 less than the basic model on Amazon and the basic models on Alibaba are $179-$199...
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PM me with your grow area dimensions, power consumption needs, and budget. I'll find your fixture(s) for you.
Thanks man! I can build a setup for a very comparable price but honestly that's a great deal! And no DIY :)