This is the place I always get mine from,
http://www.yourcablehookup.com/fluorescent-highbay-lamp-t5homt-ychfhb65homt-p-28393.html
Might not be the cheapest, but they have very reasonable shipping. Just make sure you add 6 bulbs, not just 1 like I did.
But when I did that, they sent me the other 5 with free shipping, great support and will always buy from them no matter the price they are charging. (Well packed too)
I get the wire mesh for my lights... it doesn't connect very well, but someday I kinda invision securing it more and hanging small plants from it a bit someday
The growth of my nepenthes has been night and day after I've purchased these lights. Just watch the dimensions, I got a little overzealous and bought a 6 bulb fixture that couldn't fit in my grow rack.
-Nate