[Jemima]

I have just bought some great cubes from Robert May. Check out the website under wire cube mini grid panel. £20 for 17 grids and 20 connectors. You have to pay postage too but it's the only place I found them. The screwfix ones were mesh not wire and more expensive too.
Have just built a 4 x 2 and am waiting to pick up some correx ready for getting the piggies next week. Can't wait ! Hope this helps someone.