They look like this:
http://www.coopathome.ch/b2c_coop/ca...0000000A0301CE
If you are eating a gluten-free diet, then make sure you check the ingredients list. Not all are gluten-free.
Also, you can try a health food store - they are 100% guaranteed to have them, but probably more expensive. We buy big packs of plain rice cakes at Denner...and we love the chocolate ones...