While I am new to chickens I'm definitely not new to rabbits. Good luck with the meat ones!
I would suggest the following places for supplies:
www.kdcage.com
www.kwcages.com
www.bassequipment.com
www.bunnyrabbit.com
In addition if you're interested in rabbit management software to keep track of breeding and production
www.evans-software.com
Of course I reccomend joining the ARBA (American Rabbit Breeders Association)
www.arba.net they are invaluable.
I have been an official registrar for them for over 4 years and a member of the ARBA for over 11. If anyone has specific question please PM me at any time. If I don't know the answer I'll know who to call
editing to answer caging size question:
24 X 18 - Great for small breeds and their does with litters
24 x24 - Again, good for small breeds approaching larger breeds like the Dutch (5lbs) and housing commercial strain New Zealand bucks
24 x 36 - Good for housing meat rabbits or finishing out some youngsters. This is the minimum size cage you should be using for a meat pen doe and her litter.
24 x 48 - Almost mandatory for Flemish, Giant Chins, Checkered Giants etc; (Checkerds also need additional cage height.
Remember when raising rabbits for meat purposes you want a fast reproducer, that can produce a 4-6 pound baby in 8 weeks. Many people look at Flemish and think oh wow this is huge! But, in my humble opinion nothing is better than a new zealand. They are fast, efficient. Some of the "commercial" breeds have had their productivity and feed to flesh conversion bred out in favor of showing. They are still good eats, just much more slower and more expensive. Think of it as raising a slow growing chicken breed for meat purposes.