Rabbit Hutch?

I live in North Carolina, and recently rescued a New Zealand white from a reasearch facility, he was a tiny baby when i got him but now he's almost 15 pounds and the cage he's in is TOO small. I'm trying to find a hutch that is outdoors safe, and BIG. like no smaller then 6 feet. Any idea where i can find one? The only big one's i've been able to find it in the Uk. Why is that?