On the internet, or any brick-n-mortar hydroponics shop.
Something like this, perhaps:
http://www.amazon.com/iPower-Grow-Light-Premium-Digital/dp/B003BLWQJ8/ref=sr_1_fkmr0_2?ie=UTF8&qid=1322859116&sr=8-2-fkmr0
You'll likely need a couple, as hops need to trellis to grow properly.
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