something like this? http://www.mtixtl.com/Al2O3-Ceramic-505005S1- 
HP.aspx
if you are not picky (surface smoothness, purity etc), you can check  
university MEMS network if they have small qty on stock (they usually  
keep stock for student project).  if you want large qty, kyocera is a  
good bet... if you need high density, not sure edicott still supply  
it or not...(I usually ask  supply for the left over batch ends,  
especially black ceramic for optical parts - can't afford to use  
batch for prototype... you usually get very good deal... but qty is  
un-certain... you have odd pieces and you might need to cut your self  
- cutting ceramic is not as easy as glass)...
jk
On Mar 28, 2018, at 2:20 PM, Douglas Pauls wrote:

> Good afternoon all,
>
> I seek to harness the prodigious experience of the forum.  I am  
> looking for
> small (2" x 2") squares of low temperature co-fired ceramics.  No
> particular properties needed.  Anyone know of a source for  
> something like
> this?
>
> Doug Pauls
> Principal Materials and Process Engineer
> Rockwell Collins