Hi Perry,
I usually make mein bricken, and not at a very high cost. I purchase some self hardening clay, cut off a small chunk at at time, and roll flat, usually about 2-3mm thick. Square off the ends with a knife, and put the remainder back onto the block of clay.
Now, take a ruler, and a sharp scalpel blade, and cut strips, 2mm wide strips seem to be the standard for making bricks. Then cut about every 4mm, and you have your bricks.
Put onto a piece of paper to fully harden, and once done can be painted. I've made a jig to paint all of the bricks at once, and it may help. I took a piece of window screen, and stapled it to a little rectangle wooden frame. Put your bricks in the frame, and dunk it in some severly thinned paint, or pour the paint over top of the bricks, what ever's easiest. Boom, all of your bricks are now painted. I used a Navajo Red house stain to do mine, and it worked perfect.
You can also do the same as above, but with thin sheets of cork. Once you get a rythym going, you can really crank out the suckers!
Kancali Dio Products also make brick/rubble moulds as well, you can use either plater or resin.
"There you go with those negative waves again!"