There is a member who bought one of these recently. He's planning to retrofit just the LED inside of a 10W LED floodlight that he's already bought. Plug and play for him, but not the most cost efficient. Same thing, though, really. I don't think he's even received the LED yet, though, so there's nothing I can really point a finger at currently.
Alternatives? Yea, you could buy a bunch of 3W LED's, figure out what driver you need, buy an extruded Aluminum heat sink to mount the LED's onto, the rest is just assembly. You could also buy 5050 SMD LED strips. A member named stardustsailor recently built a grow strip of these with variable driver box, and another member name Panelata has a grow currently in progress
here. You'll want to make sure you get the right wavelength, though, in order zero in on photosynthesis peaks. A Chinese company named VanQ has 5050 SMD strips with the colors you want, although I don't know how much money those will run you,
or how much shipping will be. The 5050 strips are also one of the less efficient LED growing methods, but they could be worth their weight in Gold depending how tight of a grow space you've got exactly.
Apart from those options, maybe these?
http://www.ebay.com/itm/1-pcs-6000K-10W-Cool-White-High-Power-Square-LED-Bulb-Super-Bright-Light-45mil-/130864817150?pt=LH_DefaultDomain_0&hash=item1e7826a3fe
Same deal as the first link I sent you (the 10W LED with Red/Blue chips), but this one is Cool White. The Whites are a boat load cheaper just because you add the term "grow" to a light and there's an immediate 200% markup. You can use just Cool Whites and Warm Whites, or maybe mix some 3W 660nm LED's in there if your budget permits. 45mil chips (for Blue) and 42mil chips (for Red) are about the best I've been able to find in these multi-chip LED's. The larger the chip the more light (less heat) the chip produces per watt (usually). So try and make sure the vendor specifically states the chip size and pray they're not lying scumbags. Also, the link I gave you says 45mil. Yes, even though it's a White LED it's using Blue chips. There's a phosphor layer over the chips that is excited by Blue light which subsequently emits White light. That vendor has some nice stuff, and even they might be willing to cop you a deal if you purchased multiple lights, heat sinks, drivers, etc. from them. Can't hurt to ask what people can do for you.
Edit - Forgot to mention. Hell, no, don't take my word and plunk down $100+ on something. Read as much as your brain can withstand and make the best educated decision that you can. For one, that 10W has a Blue chip on it. There's plenty of people who hate Blues these days and just want combinations of Whites (different CCT's) coupled with Reds. Really, there's as many ways to use LED's as there are growers, so find your niche and be happy with whatever route you take.