Calcios is available from Baar.com which is the official supplier of Edgar Cayce 's products (according to the A.R.E. which was founded by Cayce). Although the ingredients do not specify they type of bone meal used, since they follow Cayce's formulas it may very well contain chicken bone meal.
Another option is a very durable, high-speed blender like a VitaMix. Although these are a considerable expense initially, they can be used to pulverize chicken bones...and a long list of other uses. You can also purchase reconditioned VitaMixes for a considerable savings. Seems to me that this would be a great way to use what would normally be tossed in the trash! Now THAT'S a cheap source of calcium (once you've purchased the equipment)!