I'd seriously look to finding a supplier/wholesaler from China.
Big list:
http://www.alibaba.com/products/porc...---10-747.html
Something like this?
http://www.alibaba.com/product-gs/32...llar_item.html
Minimum order is 2400 plates, they can supply 50,000 plates a month. They are 12.75 inches in diameter and cost about 50 cents each so for $1200, you'd get enough plates to break for 16-20 months. You could probably find cheaper if you look harder but there are hundreds of listings.