Brakes International, try these guys. I sent both the rear callipers off the missus EK4 to them in exchange for recon ones, they are rebuilt with all new seals and new look, can't remember the exact price, maybe £59? you pay them full price, and when they receive your old ones back they refund you the difference. These were Nissin castings as well so OEM. In the past i have allways re-built mine with the Honda seal kit (£26) and took the opurtunity to powder coat them too. Last time round i replaced the pistons in both, they cost £22. For the cost i probably could've got replacemants.
I suppose you could look at people on here breaking civic's