I use the same type of pills Steve.
I have to cut it in many pieces to give it to the hens.
Sometimes having all the supplements in front of the birds still doesn't cut it as you mentioned.
Some birds just don't eat it and some eat a lot but the body can only process so much and much of what's eaten goes out the other end.
This is especially true if there is not enough supplement of Vitamin D with the Calcium.
With out it the body doesn't utilize the calcium at all.
For this reason I prefer parsley.
It provides both of them in the same time and at a pretty decent ratio.
On top of other goodies it offers.
I get the calcium with the vitamin D from the local drug store or the grocery store.
Nothing special really.
I am sure Oz is pretty similar to the States when it comes to shopping