Admittedly, Kalyx.com 
is not a specialized hydroponics E-shop, but their section on hydroponic and gardening products is so complete that it can rival any such shop on the Internet. It's actually quite difficult NOT to find what you're looking for on Kalyx, since they offer a large list of products coming from a wide array of brands, cheap to expensive.
Complete hydroponic systems based on ebb and flow, drip and water culture mechanics, components ranging from growth trays or containers to water pumps and nutrient enhancers a wide range of light systems and light bulbs and a number of other hydroponic accessories make Kalyx.com one of the leaders in online gardening shopping.
