Folding/Travel Keyboard

Do keyboards that fold-up for easy transport exist? Or am I loosing it, I swear I remember finding those once, or maybe it rolled up, now there is someone that could use one as a cheaper alternative to fixing the laptop keyboard, and I can't find them. If anyone knows if they exist/where, please let me know.

 

http://majorgeeks.pricegrabber.com/search_getprod.php/masterid=547678/search=indestructible

 

I started to buy one of those roll-up ones once-- it was like molded silicone rubber with membrane switches embedded in it. It seemed like it would work OK, but I ultimately decided against it because it offered only a 90 day warranty (which was not stated on the outside of the package-- I asked a store employee to open the sealed box for me).