Try Valley design website they have couple of 3" and
4" saphhire wafers.
Also try these vendors too.
  Wafer World Inc.: Tel. 561-842-4441, Fax
561-842-2677, www.waferworld.com, email:
sales@waferworld.com. I know they have sapphire.

b.       Silicon Quest International: Tel.
408-496-1000, Fax 408-496-1133, www.siliconquest.com

c.       Montco Silicon Technologies, Inc.: Tel.
610-948-6880, Fax 610-948-8014, www.silicon-wafers.com


imran
--- Honggang Jiang  wrote:
> hi all:
> I need a couple of 3" or 4" sapphire wafers (single
> side polished, around 400 um thick), could anybody
> let me know where can i buy them? Thanks
>
> Honggang Jiang
> Materials Science Engineer
> Second Sight
> 12744 San Fernando Road, Bldg3
> Sylmar, CA 91342
> Ph: 818 833 5058
>
>
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