Hi,
 What kind of stamps you need, whether PDMS based stamps or hard stamps, you
can find sylgard 184 (dow corning sells this). It is a mixture to make PDMS
stamps for your desired pattern needs. I am not completely sure if any
company is making stamps as you need. But you can get information on
comapnies and research centers that are working with NIL...

follow this link : http://www.napanil.org/

Righeira